View source for HMAS Sydney (R17)

{{short description|Royal Australian Navy Majestic-class aircraft carrier}}
{{other ships|HMAS Sydney|HMS Terrible}}
{{Use Australian English|date=September 2013}}
{{Use dmy dates|date=October 2021}}
{{Infobox ship
|section1={{Infobox ship/image
 |image=HMAS Sydney (R17) (AWM 301423).jpg
 |image_caption=HMAS ''Sydney'' arriving in Port Melbourne in 1949
 |image_alt=An aircraft carrier travelling at slow speed. Naval personnel in black uniforms are lined up on the forward half of the flight deck, while propeller aircraft with folded wings crowd the back half.
 }}

|section2={{Infobox ship/career
 |country=Australian Navy
 |flag={{shipboxflag|Australia|naval}}
 |namesake=City of [[Sydney]]
 |builder=HM Dockyard Devonport, England
 |laid_down=19 April 1943
 |launched=30 September 1944
 |commissioned=16 December 1948
 |decommissioned=30 May 1958
 }}

|section3={{Infobox ship/career
 |hide_header=Yes
 |recommissioned=7 March 1962
 |decommissioned=12 November 1973
 |reclassified=*Training ship
               *(22 April 1955)
               *Fast troop transport
               *(7 March 1962)
 |motto="Thorough and Ready"
 |nickname=*''Vung Tau Ferry''
           *(as fast troop transport)
 |honours=*'''Battle honours:'''
          *Korea 1951–52
          *Malaysia 1964
          *Vietnam 1965–72
          *plus [[HMAS Sydney#Battle honours|seven inherited honours]]
 |fate=Sold for scrap in 1975
 |notes=
 |badge=[[File:HMAS sydney crest.png|center|alt=A ship's badge. A naval crown sits on top of a black scroll with "SYDNEY" written in gold. This is atop a yellow, rope-patterned ring, in which a red anchor is centred. Below the ring are a stone axe and a nulla nulla sitting on top of a boomerang. At the bottom of the badge is a black scroll with "THOROUGH AND READY" written.]]
 }}

|section4={{Infobox ship/characteristics
 |header_caption=as aircraft carrier
 |class={{sclass|Majestic|aircraft carrier}}
 |displacement=*15,740&nbsp;tons (standard)
               *19,550&nbsp;tons (deep)
 |length=*{{convert|630|ft|m|abbr=on}} [[between perpendiculars]]
         *{{convert|698|ft|m|abbr=on}} overall
 |beam={{convert|80|ft|m|abbr=on}}
 |draught={{convert|25|ft|m|abbr=on}}
 |propulsion=*4 × [[Admiralty 3-drum boiler]]s
             *Parsons single reduction geared turbines
             *2 shafts
             *{{convert|40000|shp|abbr=on|lk=in}}
 |speed={{convert|24.8|kn}}
 |complement=*1,100 (peace)
             *1,300 (war)
             *<Small>Both include Fleet Air Arm personnel</small>
 |sensors=*2 × 227Q
          *1 × 293M
          *1 × 960/281BQ
          *1 × 961
 |armament=30 × [[Bofors 40 mm Automatic Gun L/60|Bofors 40 mm guns]] (18 single mountings, 6 twin mountings)
 |aircraft=Up to 38 aircraft
 |notes=Taken from:<ref name=Janes68/><ref name=Cassells164.5/>
 }}

|section5={{Infobox ship/characteristics
 |header_caption=as fast troop transport
 |type=Fast Troop Transport
 |displacement=*14,380&nbsp;tons (standard)
               *19,550&nbsp;tons (full load)
 |boats=*6 × LCM Mark VI
        *(1968 onwards)
 |troops=
 |complement=*544 core
             *Increased to 1,000 when required
 |armament=4 × Bofors 40 mm guns (4 single mountings)
 |aircraft=4 × Wessex helicopters (occasionally embarked)
 |notes=*Other characteristics as above
        *Taken from:<ref name=Janes68/><ref name=Cassells164.5/>
 }}
}}

'''HMAS ''Sydney'' (R17/A214/P214/L134)''' was a {{sclass|Majestic|aircraft carrier|0}} light [[aircraft carrier]] operated by the [[Royal Australian Navy]] (RAN). She was built for the [[Royal Navy]] and was [[Ceremonial ship launching|launched]] as '''HMS ''Terrible'' (93)''' in 1944, but was not completed before the end of [[World War II]]. The carrier was sold to Australia in 1947, completed, and [[Ship commissioning|commissioned]] into the RAN as ''Sydney'' in 1948.

''Sydney'' was the first of three conventional aircraft carriers{{efn|For the purpose of this article, a conventional aircraft carrier is defined as a ship designed primarily to launch and recover multiple fixed-wing aircraft from a flight deck, and operated as such. This definition does not include seaplane tender {{HMAS|Albatross|seaplane tender|6}}, or the {{sclass|Canberra|landing helicopter dock|0}} amphibious warfare ships.}} to serve in the RAN, and operated as the navy's [[flagship]] during the early part of her career. From late 1951 to early 1952, she operated off the coast of Korea during the [[Korean War]], making her the first carrier owned by a [[Commonwealth of Nations|Commonwealth]] [[Dominion]], and the only carrier in the RAN, to see wartime service. Retasked as a training vessel following the 1955 arrival of her modernised sister ship, {{HMAS|Melbourne|R21|6}}, ''Sydney'' remained in service until 1958, when she was placed in reserve as surplus to requirements.

The need for a [[sealift]] capability saw the ship modified for service as a fast troop transport, and recommissioned in 1962. ''Sydney'' was initially used for training and a single supply run in support of [[Indonesia–Malaysia confrontation|Malaysia's defence policy against Indonesia]], but in 1965, she sailed on the first voyage to [[Vũng Tàu]], transporting soldiers and equipment to serve in the [[Vietnam War]]. 25 voyages to Vietnam were made between 1965 and 1972, earning the ship the nickname '''"Vung Tau Ferry"'''.

''Sydney'' was decommissioned in 1973, and was not replaced. Despite several plans to preserve all or part of the ship as a [[maritime museum]], tourist attraction, or car park, the carrier was sold to a South Korean steel mill for [[Ship breaking|scrapping]] in 1975.

==Design==
{{main|1942 Design Light Fleet Carrier}}
''Sydney'' was one of six {{sclass|Majestic|aircraft carrier|0}} light fleet carriers; a modified version of the {{sclass|Colossus|aircraft carrier|0}} carrier, incorporating improvements in flight deck design and habitability.<ref name=Hobbs5/> These two classes of carriers were intended to be 'disposable warships': they were to be operated during World War II and scrapped at the end of hostilities or within three years of entering service.<ref>Hobbs, in ''The Navy and the Nation'', p. 217</ref> ''Sydney'' was the second ship of the class to enter service, following Canadian aircraft carrier {{HMCS|Magnificent}}.<ref name=SPC/>

The carrier had a standard [[Displacement (ship)|displacement]] of 15,740 tons, and a deep displacement of 19,550 tons.<ref name=Cassells164.5>Cassells, ''The Capital Ships'', pp. 164–5</ref> Her length was {{convert|630|ft|m}} [[between perpendiculars]] and {{convert|698|ft|m}} at her longest point, with a [[Beam (nautical)|beam]] of {{convert|80|ft|m}} and a [[Draught (hull)|draught]] of {{convert|25|ft|m}}.<ref name=Cassells164.5/> ''Sydney'' was fitted with four [[Admiralty 3-drum boiler]]s, which provided steam to Parsons single reduction geared turbines; these supplied {{convert|40000|shp|abbr=on|lk=in}} to the two propeller shafts, and allowed the ship to reach {{convert|24.8|kn}}.<ref name=Cassells164.5/> The average size of the ship's company in peacetime was 1,100, but could be increased to 1,300 for wartime deployments.<ref name=Cassells164.5/> Refitting the ship to serve as a transport reduced the standard displacement to 14,380 tons and the ship's company to a core of 544, which was supplemented by trainees and personnel from the [[Royal Australian Navy Reserve]] when required.<ref name=Janes68>Blackman (ed.), ''Jane's Fighting Ships (1968–69)'', p. 12</ref><ref name=Cassells164.5/>

{{anchor|planned upgrade}}
The [[British Admiralty]] predicted that all ''Majestic''-class carriers would require upgrades to their aircraft [[Elevator#Aircraft elevators|lifts]] and [[arrester gear]] in the early 1950s, to operate the faster and heavier carrier aircraft under development.<ref name=wright151/> Originally, the RAN wanted to upgrade ''Sydney'' to the same or similar standard as sister ship {{HMAS|Melbourne|R21|2}}, after the second carrier was delivered.<ref name=ANAM105/> The installation of an [[angled flight deck]] and [[mirror landing aid]], would have allowed ''Sydney'' to operate modern jet aircraft.<ref name=ANAM105>ANAM, ''Flying Stations'', p. 105</ref> However, financial and manpower restrictions led to the cancellation of this program.<ref name=wright160>Wright, ''Australian Carrier Decisions'', p. 160</ref>

===Armament, sensors, and aircraft===
''Sydney'' was initially armed with thirty [[Bofors 40 mm Automatic Gun L/60|Bofors 40 mm anti-aircraft guns]]: eighteen single mountings and six twin mountings.<ref name=Cassells164.5/> During her refit as a [[Troopship|troop transport]], the carrier's armament was reduced to four single Bofors.<ref name=Janes68/>

The [[radar]] suite included two [[Type 277 radar|Type 277Q]] height-finding sets, one [[Type 293 radar|Type 293M]] surface search set, one Type 960/281BQ long-range air warning set, and one Type 961 air search set.<ref name=Cassells164.5/>

[[File:HMAS Sydney flight trials 1949.jpg|thumb|right|alt=The deck of an aircraft carrier with a propeller aircraft towards the front of the ship. Some of the ship's superstructure is at right, including a board displaying the wind conditions|A Sea Fury preparing to take off from ''Sydney'' during her flight trials in January 1949]]

As an aircraft carrier, ''Sydney'' operated with the RAN [[Fleet Air Arm (RAN)|Fleet Air Arm's]] 20th and 21st Carrier Air Groups (CAGs), which were assigned alternately to the carrier.<ref name=Cooper.opp160/> The former was made up of [[805 Squadron RAN|805]] and [[816 Squadron RAN|816]] Squadrons, while the latter was made up of [[808 Squadron RAN|808]] and [[817 Squadron RAN|817]] Squadrons.<ref name=Cooper.opp160/> Twenty-four aircraft, split evenly between [[Hawker Sea Fury]] fighters and [[Fairey Firefly]] attack aircraft, were normally carried.<ref name=Cooper.opp160/> Two [[Supermarine Sea Otter]] amphibious aircraft were carried for rescue duties (but were never required for this purpose); they were not attached to any squadron, but operated as the 'Ship's Flight'.<ref>ANAM, ''Flying Stations'', p. 62</ref> The amphibians were removed from the ship at the start of her Korean War deployment, and were replaced by a helicopter.<ref>ANAM, ''Flying Stations'', p. 106</ref> During the carrier's Korean War deployment, 805 Squadron was added to the 21st CAG to form a 38-strong wartime air group.<ref name=ANAM81/>

While undergoing conversion into a troop transport, the ability to operate aircraft was removed from ''Sydney''.<ref name=Cooper.opp160/> However, on seven of the troopship's twenty-five voyages to Vietnam, she carried a flight of four [[Westland Wessex]] helicopters, sourced from either [[725 Squadron RAN|725]] or [[817 Squadron RAN|817 Squadron]], for anti-submarine surveillance.<ref name=Coop204>Cooper, in ''The Royal Australian Navy'', p. 204</ref><ref name=NottPayne33>Nott & Payne, ''The Vung Tau Ferry'', p. 33</ref>

==Construction and acquisition==
The ship was [[Keel laying|laid down]] by [[HM Dockyard Devonport]] in England as HMS ''Terrible'' on 19 April 1943, with the [[Nancy Astor, Viscountess Astor|Viscountess Astor]] presiding over the ceremony.<ref name=Cassells165>Cassells, ''The Capital Ships'', p. 165</ref> She was the only aircraft carrier of the ''Colossus'' or ''Majestic'' classes to be constructed in a '[[royal dockyard]]': a dockyard owned and operated by the Royal Navy.<ref>Hobbs, in ''The Navy and the Nation'', p. 210</ref> She was launched on 30 September 1944 by the wife of British politician [[Duncan Sandys]].<ref name=Cassells165/> Work on the ship continued until the end of World War II, when the Admiralty ordered the suspension of all warship construction.<ref name=Hobbs5>Hobbs, ''HMAS Melbourne II – 25 Years On'', p. 5</ref>
[[File:Aircraft carrier Terrible launch.jpg|thumb|left|alt=Photograph of the bow of an aircraft carrier as it slides backwards down a slipway. Crowds are gathered around the slipway, underneath several cranes|Launch of HMS ''Terrible'', which later became HMAS ''Sydney'']]

A post-war review by the Australian government's Defence Committee recommended that the RAN be restructured around a task force incorporating multiple aircraft carriers.<ref>Donohue, ''From Empire Defence to the Long Haul'', p. 33</ref> Initial plans were for three carriers, with two active and a third in reserve at any given time, although funding cuts led to the purchase of only two carriers in June 1947; ''Terrible'' and sister ship ''Majestic'', for the combined cost of [[Australian pound|AU£]]2.75 million, plus stores, fuel, and ammunition.<ref name=Hobbs5/><ref>Donohue, ''From Empire Defence to the Long Haul'', pgs. 38, 45–47</ref> As ''Terrible'' was fitted out as a flagship and was the closer of the two ships to completion, construction was finished without major modification.<ref name=Hobbs5/><ref name=wright151>Wright, ''Australian Carrier Decisions'', p. 151</ref> Although ''Terrible'' was due for completion on 24 June 1948, a skilled labour shortage affected the installation of the ship's boilers, causing the Admiralty to revise the delivery date to October 1948.<ref>Wright, ''Australian Carrier Decisions'', p 155</ref>

A commissioning crew for the aircraft carrier was raised in Australia from the ship's company of the decommissioned [[cruiser]] {{HMAS|Hobart|1934|2}}, which departed from Sydney aboard {{HMAS|Kanimbla|1936|6}} in June 1948.<ref name=ANAM57>ANAM, ''Flying Stations'', p. 57</ref> Ex-Royal Navy sailors were used to fill out the carrier's complement.<ref name=ANAM57/> ''Terrible'' was handed over to the RAN on 16 December 1948, and was commissioned at noon as HMAS ''Sydney''.<ref name=ANAM60>ANAM, ''Flying Stations'', p. 60</ref> One of the reasons behind the choice in name was so AU£426,000 raised by the HMAS ''Sydney'' Replacement Fund after the loss of the [[HMAS Sydney (D48)|light cruiser HMAS ''Sydney'']] in 1941 could be accessed.<ref name=ANAM60/> ''Sydney'' was the last vessel to be commissioned into the RAN as [[HMAS|'His' Majesty's Australian Ship]]: as after the death of [[George VI of the United Kingdom|King George VI]] on 6 February 1952 and the coronation of [[Elizabeth II of the United Kingdom|Queen Elizabeth II]], all RAN ships became 'Her' Majesty's.<ref name=Cooper.opp160>Cooper, in ''The Royal Australian Navy'', opp. p. 160</ref>

==Operational history==

===1949–1951===
[[File:Fireflies and Sea Furies over HMAS Sydney (R17) c1949.jpg|thumb|Fireflies and Sea Furies overfly ''Sydney'']]
Although commissioned in mid-December 1948, ''Sydney'' did not enter service until 5 February 1949, as work was still being completed.<ref name=Cassells165/> On 25 December 1948, while still fitting out in Devonport, a helicopter from {{USS|Columbus|CA-74|6}} carrying [[Santa Claus]] became the first aircraft to land on ''Sydney''{{'}}s flight deck.<ref>Lind, ''The Royal Australian Navy'', p. 220</ref> The ship's sea trials and post-commissioning workup were not without event: in early December 1948, a [[771 Naval Air Squadron]] [[de Havilland Mosquito]] crashed while helping ''Sydney'' calibrate her radar suite, killing both British aircrew, and a RAN pilot undergoing landing qualifications aboard {{HMS|Illustrious|R87|6}} on 17 March 1949 crashed while attempting to land: none were killed, but the pilot's [[Fairey Firefly]] and four others in the deck park were destroyed.<ref>ANAM, ''Flying Stations'', p. 59</ref>

[[File:HMAS Sydney arrival 1949.jpg|thumb|left|alt=Grainy photograph of an aircraft carrier manoeuveing around a cliff-faced headland with a lighthouse on top. More landmasses are visible in the background.|''Sydney'' passing through the [[Sydney Heads]] for the first time on 28 May 1949]]
The carrier sailed from Devonport on 12 April 1949, carrying the 20th CAG.<ref>McCaffrie, in ''Sea power ashore and in the air'', p. 173</ref> ''Sydney'' arrived at Jervis Bay on 25 May, where the aircraft of the 20th CAG and training equipment were offloaded for transport to the new naval air station, {{HMAS|Albatross|air station|6}}, before the carrier proceeded to her namesake city.<ref>ANAM, ''Flying Stations'', p. 69</ref> ''Sydney'' arrived in Sydney on 2 June, and took over as Flagship of the Australian Fleet from {{HMAS|Australia|D84|6}} on 25 August.<ref name=ANAM73>ANAM, ''Flying Stations'', p. 73</ref><ref name=Bastock304>Bastock, ''Australia's Ships of War'', p, 304</ref> 20th CAG was reembarked during August, and ''Sydney'' exercised in Australian and New Guinea waters until late November.<ref name=ANAM73/> From January to April 1950, the carrier continued training exercises and visited ports in south-east Australia and New Zealand, and on 7 June, she departed for England to collect the 21st CAG.<ref name=ANAM74.5>ANAM, ''Flying Stations'', pp. 74–5</ref> The 21st CAG embarked in October, and the carrier returned to Australia in December.<ref name=ANAM74.5/> Before ''Sydney'' departed in late October, the British Admiralty suggested that she be deployed to the [[Korean War]] as relief for {{HMS|Theseus|R64|6}} and her worn-out catapult, but this was withdrawn because of the plan's drawbacks.<ref>ANAM, ''Flying Stations'', p. 76</ref>

On 29 January 1951, ''Sydney'' was part of an eighteen-ship fleet present in Sydney Harbour to celebrate the 50th anniversary of [[Federation of Australia|Australia's Federation]].<ref>Lind, ''The Royal Australian Navy'', p. 224</ref> Following this, the carrier joined a multinational training exercise in south-east Australian waters, then visited Hobart for the [[Royal Hobart Regatta]].<ref name=ANAM80>ANAM, ''Flying Stations'', p. 80</ref> During the exercise, a Sea Fury accidentally fired four practice rockets into the superstructure of the New Zealand flagship, {{HMNZS|Bellona||6}}: although an inquiry concluded that the pilot had unintentionally pressed the fire button, it was later found that certain signal frequencies transmitted by ''Sydney''{{'}}s radio aerials could trigger a Fury's firing circuits.<ref name=ANAM80/> ''Sydney'' was presented with the [[Gloucester Cup]] in April 1951, recognising her as the most efficient ship in the RAN for 1950.<ref name=column8>{{cite news |url=https://news.google.com/newspapers?id=pfgQAAAAIBAJ&sjid=EpMDAAAAIBAJ&pg=3436,6856700 |title=Column 8 |date=19 April 1951 |work=The Sydney Morning Herald |access-date=29 July 2009}}</ref><!-- Need to find a source that is more authoritative than [[The Sydney Morning Herald#Column 8|Column 8]], a newspaper readers' observations column --> The two CAGs were switched over in April, and on 3 May, a Sea Fury crashed during a [[rocket-assisted take off]]; the pilot became the carrier's first fatality.<ref name=ANAM81>ANAM, ''Flying Stations'', p. 81</ref>

===Korean War (1951–1952)===
[[File:Sydney Korea (AWM 044274).jpg|thumb|right|alt=The aft section of an aircraft carrier's flight deck. Several propeller aircraft are parked here, and are being worked on.|Firefly aircraft on board HMAS ''Sydney'' during her Korean War deployment]]
{{See also|Military history of Australia during the Korean War}}
In March 1951, the [[First Sea Lord]] requested that ''Sydney'' be deployed to Korea while {{HMS|Glory|R62|6}} was refitted in Australia, to maintain a [[Commonwealth of Nations|Commonwealth]] carrier presence.<ref name=McCaffrie174>McCaffrie, in ''Sea power ashore and in the air'', p. 174</ref><ref name=Hobbs66>Hobbs, ''British Commonwealth Carrier Operations of the Korean War'', p. 66</ref> This was agreed to, and a 38-strong wartime CAG was formed on 14 May by incorporating the Sea Furies of 805 Squadron into the 21st CAG.<ref name=ANAM81/> Because RAN Fireflies were optimised for anti-submarine warfare, and consequently not fitted with cannon, cannon-equipped RN aircraft were loaned for the duration of ''Sydney''{{'}}s deployment.<ref>ANAM, ''Flying Stations'', p. 79</ref> After completing pre-departure exercises, during which several aircraft were destroyed in non-fatal, weather-induced deck crashes, ''Sydney'' and the destroyer {{HMAS|Tobruk|D37|6}} sailed for Korea on 31 August.<ref name=McCaffrie174/> While en route, the carrier's aircraft were used for a fly-past demonstration over [[Rabaul]] on 6 September, following civil unrest.<ref>ANAM, ''Flying Stations'', p. 84</ref> On her arrival, ''Sydney'' became the first aircraft carrier owned by a Commonwealth dominion to see wartime service.<ref name=Hobbs66/>{{efn|Two aircraft carriers (HM Ships {{HMS|Puncher|D79|2}} and {{HMS|Nabob|D77|2}}) were crewed by Canadians during World War II. However, these were commissioned into the Royal Navy, which had in turn received them on loan from the United States Navy as part of the [[Lend-Lease]] program.}}

[[File:Korean Peninsula topographic map.png|thumb|left|upright|alt=Topographic map of the Korean peninsula|A map of the [[Korean peninsula]]. ''Sydney'' operated primarily off the west coast, although she was deployed to the east coast on occasion.]]
''Sydney'' was attached to the [[United States Navy]] (USN) [[United States Seventh Fleet|Seventh Fleet]] and assigned to Task Element 95.11, which operated primarily off the western coast of Korea.<ref>McCaffrie, in ''Sea power ashore and in the air'', p. 175</ref><ref>Dennis et al, ''The Oxford Companion to Australian military history'', p. 209</ref> The carrier was sent on nine or ten-day patrols in the operational area, with nine-day replenishment periods in [[Sasebo, Nagasaki]] or [[Kure, Hiroshima]] between each; to maintain coverage, ''Sydney'' alternated with a USN carrier (initially {{USS|Rendova|CVE-114|6}}, then from December with {{USS|Badoeng Strait|CVE-116|6}}).<ref name=McCaffrie178>McCaffrie, in ''Sea power ashore and in the air'', p. 178</ref> RAN aircraft were mainly used for [[air strike]]s against North Korean units and supply lines; secondary duties including [[Aerial reconnaissance|reconnaissance]], [[artillery observer|bombardment spotting]], [[combat air patrol]]s, and [[Anti-submarine warfare|anti-submarine patrols]].<ref name=McCaffrie178/> During her deployment, the carrier operated an unarmed USN [[Sikorsky H-5|Sikorsky Dragonfly]] (designation UP28, which acquired the nickname "Uncle Peter") in the search-and-rescue and [[plane guard]] roles.<ref name=Cassells168>Cassells, ''The Capital Ships'', p. 168</ref> This was the first helicopter to operate from an Australian warship, and the first USN equipment used by the RAN.<ref name=FramePP>Frame, ''Pacific Partners'', p. 91</ref> The success of helicopter operations convinced the RAN to acquire three [[Bristol Sycamore]]s; the first helicopter squadron in Australian military service.<ref name=Cooper178>Cooper, in ''The Royal Australian Navy'', p. 178</ref>
''Sydney''{{'}}s first patrol commenced on 4 October, with two days spent providing air support of efforts to push the front line away from the [[Han River (Korea)|Han River]].<ref name=Lind168>Lind, ''The Royal Australian Navy'', p. 168</ref><ref name=McCaffrie179>McCaffrie, in ''Sea power ashore and in the air'', p. 179</ref> ''Sydney'' was then briefly repositioned off the east coast, where her aircraft flew strike missions near [[Wonsan]].<ref name=McCaffrie179/> After returning to the east coast, ''Sydney'' set a record on 11 October for light carrier operations: her aircraft flew 89 [[sortie]]s during the day, with 31 aircraft aloft at one point.<ref name=McCaffrie179/> Following her first patrol, the carrier sailed to Sasebo to resupply, but on 14 October, all ships were ordered to sea to avoid [[Typhoon Ruth (1951)|Typhoon Ruth]].<ref name=McCaffrie182>McCaffrie, in ''Sea power ashore and in the air'', p. 182</ref> Although the order to clear the anchorage was given that morning, the number of ships present meant ''Sydney'' did not leave until late in the day, and sailed during the worst part of the storm.<ref name=SPC>''HMAS Sydney (III)'', Sea Power Centre</ref> A Firefly, a {{convert|16|ft|m|adj=on}} motor dinghy, and a forklift were lost overboard, six other aircraft parked on the deck were destroyed, and the carrier experienced extreme winds—the wind recorder broke after registering {{convert|68|kn}}.<ref name=SPC/><ref name=Hobbs66/>

[[File:US Navy rescue helicopter flies over HMAS Sydney.jpg|thumb|right|UP-28 ("Uncle Peter"), the [[Sikorsky H-5|Sikorsky Dragonfly]] assigned to ''Sydney'', hovering above the carrier's flight deck]]
''Sydney''{{'}}s second patrol began on 18 October, with her aircraft involved in strikes against North Korean units, coastal shipping, railway bridges, and other supply routes.<ref name=McCaffrie179/> They also performed their first close air support mission on 21 October, providing cover for the [[1st Commonwealth Division]].<ref name=McCaffrie180>McCaffrie, in ''Sea power ashore and in the air'', p. 180</ref> Two Sea Furies were shot down on 25 October; both pilots escaped unharmed.<ref name=Cassells169>Cassells, ''The Capital Ships'', p. 169</ref> The next day, during a moderately successful strike involving five RAN aircraft against a railway tunnel, a Firefly was shot down {{convert|75|mi|km}} inland, deep inside North Korean territory.<ref name=Cassells169/><ref name=Hobbs67>Hobbs, ''British Commonwealth Carrier Operations of the Korean War'', p. 67</ref> There were doubts that a rescue helicopter could reach the crash site and return safely, as it was at the extreme limit of helicopter range and some of the return flight would occur after dark.<ref name=Lind227>Lind, ''The Royal Australian Navy'', p. 227</ref> Despite this, Uncle Peter's USN aircrew volunteered to try, and after the [[Air observer|observer]] was quickly taught how to use an [[Owen submachine gun]], the helicopter launched at 16:22.<ref name=Lind227/> The four RAN aircraft provided cover for the two downed personnel until they were ordered to return to the carrier; two of the Fireflies met Uncle Peter at 17:15, and turned around to escort the helicopter.<ref name=Lind227/> At 17:33 Uncle Peter arrived at the crash site and collected the RAN aircrew, with covering fire provided by the escorting Fireflies and the helicopter's observer.<ref name=Lind227/> All three aircraft were at extreme fuel limits on their return: the two Fireflies barely made it back to ''Sydney'', while Uncle Peter arrived at [[Kimpo Airport|Kimpo air base]] at 18:30 and had to land with the aid of truck headlights.<ref name=Cassells169/><ref name=Lind227/> The rescue was the longest helicopter rescue transit over North Korean territory during the war, and Sikorsky pilot received both the British [[Distinguished Service Medal (United Kingdom)|Distinguished Service Medal]] and the United States [[Navy Cross]]: the only instance of these two medals being awarded to the same person for the same action.<ref name=Lind227/><ref name=McCaffrie183>McCaffrie, in ''Sea power ashore and in the air'', p. 183</ref> ''Sydney'' was relieved by USS ''Rendova'' on 27 October and returned to Kure.<ref name=Cassells169/>

[[File:HMAS Sydney 1951.jpg|thumb|left|alt=A aircraft carrier at anchor in still waters. Propeller aircraft are visible on her deck.|''Sydney'' at anchor in Korean waters during 1951]]
''Sydney'' began her third patrol on 5 November, operating on the west coast of Korea and escorted by the Canadian destroyers {{HMCS|Athabaskan|R79|2}}, {{HMCS|Cayuga|R04|2}} and {{HMCS|Sioux|R64|2}}, and American destroyers {{USS|Hanna|DE-449|2}} and {{USS|Collett|DD-730|2}}.<ref name=Cassells169/> On the same day, the first RAN casualty of the war occurred, when a Sea Fury pilot failed to pull up from a strafing run and crashed.<ref>Lind, ''The Royal Australian Navy'', p. 226</ref> Despite foul weather, the carrier's aircraft continued to attack lines of supply and communication, and provide support to United Nations ships: the 1000th combat sortie was flown on 12 November, a day before the patrol's end.<ref name=Cassells169/> On 18 November, after replenishing in Sasebo, ''Sydney'', ''Tobruk'', and the British light cruiser {{HMS|Belfast|C35|6}} sailed to [[Hŭngnam]], where they joined Task Force 95.8 to aid a USN bombardment of Hŭngnam during 20–22 November.<ref name=McCaffrie180/> On that day, ''Sydney'' was being refuelled by {{ship|RFA|Wave Chief|A265|6}} when there was an accident that resulted in a large spill of fuel and damage to ''Wave Chief''{{'}}s refuelling rig.<ref name=Wavechief>{{cite web |url=http://www.historicalrfa.org/index.php/rfa-wave-chief-ships-details |title=RFA Wave Chief |publisher=Royal Fleet Auxiliary Historical Association |access-date=7 August 2011 |archive-date=5 October 2011 |archive-url=https://web.archive.org/web/20111005111943/http://www.historicalrfa.org/index.php/rfa-wave-chief-ships-details |url-status=dead }}</ref> Aircraft from ''Sydney'' performed strikes against coastal artillery batteries, barracks, industrial areas and railway lines, and provided a combat air patrol for the ships.<ref name=McCaffrie180/><ref name=Cassells170>Cassells, ''The Capital Ships'', p. 170</ref> At the conclusion of the operation, ''Sydney'' returned to the west coast, but was unable to resume operations because of snow and high winds until 27 November, a day before being relieved.<ref name=Cassells170/>

In December, UN Command temporarily switched some of the responsibilities of Task Element 95.11 and the US [[Fifth Air Force]].<ref name=McCaffrie180/> Consequently, ''Sydney'' was required to provide air support for convoys between Japan and Korea amongst the other duties of her fifth patrol, which commenced on 7 December.<ref name=McCaffrie183/><ref name=Cassells171>Cassells, ''The Capital Ships'', p. 171</ref> On 8 December, a second RAN pilot was killed; although he successfully bailed out of his flak-damaged Sea Fury, he was struck by the tail of the aircraft and died from wounds.<ref name=Cassells170/> Four other aircraft were damaged that day.<ref name=Cassells171/> Clear weather, which lasted until 14 December, allowed the carrier to maintain a high rate of attack against North Korean troop concentrations, railways, and coastal vessels, while providing air cover for the Task Element.<ref name=Cassells171/> Ending on 18 December, the fifth patrol was the most costly to ''Sydney''{{'}}s CAG, with one pilot killed, five aircraft destroyed, and another 25 aircraft heavily damaged.<ref name=Cassells171/> The carrier was in Kure for Christmas, and relieved USS ''Badoeng Strait'' on 27 December, the start of her sixth patrol.<ref name=Cassells171/> The remaining days of 1951 were spent providing air cover in the [[Inchon]] area for both UN ground forces and supply convoys returning to Japan.<ref name=Lind227/><ref name=Cassells171/> On New Year's Day 1952, ''Sydney''{{'}}s aircraft helped repel the North Korean invasion of the island of [[Yongho Do]].<ref name=Cassells171/> The third RAN pilot to be lost in Korea died on 2 January while performing a combat air patrol around the carrier; personnel on the flight deck saw the aircraft fly into a cloud, but not emerge.<ref name=Cassells171/> No wreckage was found, and it was assumed that the plane dived into the Yellow Sea.<ref name=Cassells171/> For most of the patrol, RAN aircraft attacked artillery emplacements and concentrations of [[junk (ship)|junks]] in the [[Chodo Airport|Cho Do-Sok To]] area, while also proving air support for South Korean Army and [[irregular military|irregular]] forces.<ref name=McCaffrie180/>

[[File:HMAS Sydney snow Korea.jpg|thumb|right|alt=The flight deck of an aircraft carrier during a snowstorm, with the ship's superstructure in the background. A propeller aircraft is sitting on the snow-covered flight deck, and is being worked on by several people.|Deck crew working on a Sea Fury during a snow storm]]
''Sydney''{{'}}s seventh and final patrol commenced on 16 January, with HMAS ''Tobruk'', HMCS ''Sioux'', {{USS|Hanson|DD-832|6}} and {{USS|Radford|DD-446|6}} accompanying.<ref name=Cassells171/> This patrol was marked by minimal flying activity due to extremely poor weather and a lack of co-ordination between UN forces and the convoys RAN aircraft were meant to escort.<ref name=McCaffrie181>McCaffrie, in ''Sea power ashore and in the air'', p. 181</ref> The primary targets for strike missions were changed from North Korean supply line infrastructure to [[water tower]]s, as they took longer to repair.<ref name=McCaffrie181/> On the final day of the patrol, aircraft from ''Sydney'' did not fly at all, as overnight weather conditions had rendered all of the deck-parked aircraft unusable, including five which were completely encased in frozen sea water.<ref name=McCaffrie181/> On 25 January, ''Sydney'' was relieved by HMS ''Glory'', and sailed for home.<ref name=Hobbs66/>

''Sydney'' completed seven patrols during her 122-day Korean deployment: flying operations were conducted for 42.8 days, poor weather stopped operations for 11.7 days, transits to and from the operational area or between assignments consumed 29.5 days, and 38 days were spent in harbour.<ref>McCaffrie, in ''Sea power ashore and in the air'', pp. 183–4</ref> During this time, RAN Sea Furies flew 1,623 sorties, while the Fireflies flew 743, with the aircraft using 802 bombs, 6,359 rockets, and 269,249 rounds of {{convert|20|mm|in|adj=on}} ammunition between them.<ref name=McCaffrie181/><ref>Hobbs, ''British Commonwealth Carrier Operations of the Korean War'', p. 71</ref> Three RAN pilots were killed and a fourth seriously wounded, while thirteen aircraft were lost: nine shot down by North Korean flak artillery (which damaged aircraft on over ninety other occasions), and four to deck accidents or foul weather.<ref name=McCaffrie178/><ref name=Cooper177>Cooper, in ''The Royal Australian Navy'', p. 177</ref> Replacement aircraft were loaned from British Far East reserve supplies.<ref name=Hobbs66/>

RAN aircraft damaged or destroyed an estimated 66 bridges, 141 pieces of [[rolling stock]], over 2,000 structures, 469 watercraft, and 15 artillery pieces, while causing over 3,100 North Korean casualties.<ref name=McCaffrie184>McCaffrie, in ''Sea power ashore and in the air'', p. 184</ref> Australian damage assessment practice was considered to be conservative, and claims of great underestimation by the RAN were made by US personnel inspecting the aftermath of RAN attacks.<ref name=McCaffrie184/> Personnel from ''Sydney'' and her CAG received four [[Distinguished Service Cross (United Kingdom)|Distinguished Service Crosses]] (one with [[Medal bar|Bar]]), one [[Distinguished Service Medal (United Kingdom)|Distinguished Service Medal]], ten [[Mentioned in Despatches|Mentions in Despatches]], and two United States [[Legion of Merit|Legions of Merit]].<ref name=McCaffrie185>McCaffrie, in ''Sea power ashore and in the air'', p. 185</ref> Most of the personnel aboard would have been eligible for the [[Australian Active Service Medal 1945-1975|Australian Active Service Medal]], the [[Korea Medal]], the [[United Nations Service Medal for Korea]], and the [[Returned From Active Service Badge]], while ''Sydney'' herself was awarded the [[battle honour]] "Korea 1951–52".<ref>ANAM, ''Flying Stations'', p. 100</ref><ref name=honourslist/> The carrier's presence in Korea allowed the Australian government to avoid deploying additional Australian soldiers.<ref name=McCaffrie185/>

===1952–1958===
During her return from Korea, ''Sydney'' ferried [[Supermarine Spitfire|Spitfires]] and [[de Havilland Vampire|Vampires]] between several British bases in Southeast Asia.<ref name=ANAM105/> After a brief refit, ''Sydney'' embarked the 20th CAG in June 1952, before proceeding on a round-Australia cruise.<ref>ANAM, ''Flying Stations'', pp. 109–10</ref> The carrier visited [[Manus Island]], was present off the coast of the [[Montebello Islands]] for the first British [[Nuclear testing|atomic bomb test]], [[Operation Hurricane]], on 3 October, and arrived back in her namesake city in November.<ref name=ANAM110>ANAM, ''Flying Stations'', p. 110</ref> On 25 March 1953, ''Sydney'' departed for England with representatives from each of the three branches of the Australian and New Zealand militaries for the coronation of [[Elizabeth II of the United Kingdom|Queen Elizabeth II]].<ref name=Bastock304/><ref name=ANAM110/> The carrier and her aircraft participated in the Coronation [[Fleet Review]] on 15 June, and visited Canada, the United States, the Caribbean, Panama, Hawaii, and New Zealand on the return voyage, before reaching Sydney on 15 August.<ref name=Bastock304/><ref>ANAM, ''Flying Stations'', pp. 110–11</ref> The carrier's 10,000th deck landing occurred during this voyage: a Firefly completed the landing on 17 July, while ''Sydney'' was en route to Pearl Harbor.<ref>Hobbs, in ''The Navy and the Nation'', p. 215</ref>

''Sydney'' left Fremantle on 27 October 1953 for a second deployment to Korea, to support United Nations enforcement of the July 1953 armistice.<ref name=Cooper178/><ref name=GillettWOA130>Gillett, ''Warships of Australia'', p. 130</ref> This deployment, which concluded in January 1954, was mostly uneventful compared to the first, with flight operations limited to patrols along the [[Korean Demilitarized Zone|demilitarised zone]] established by the armistice.<ref name=Cooper178/><ref name=ANAM116>ANAM, ''Flying Stations'', p. 116</ref> During operations in Korea, one pilot died when his Sea Fury crashed into the ocean, while another pilot was killed and an [[aircraft handler]] seriously injured in separate deck accidents.<ref name=ANAM116/> ''Sydney'' returned to Fremantle on 2 June 1954.<ref name=GillettWOA130/> A [[#planned upgrade|planned upgrade]] of ''Sydney'' to a similar standard as modified sister ship ''Melbourne'' was cancelled in 1954, and she was prepared for service as a training ship.<ref name=GillettWOA130/><ref name=Cassells174>Cassells, ''The Capital Ships'', p. 174</ref> The carrier's embarked aircraft were flown off for the last time on 22 April 1955, and ''Sydney'' underwent a brief reorganisation during 26–29 April.  Not long after, she departed for New Zealand waters on her first training cruise on 2 May.<ref name=SPC/><ref name=Cassells174/> This was followed by a refit and then a quick trip from Sydney to Adelaide, thence Melbourne, and back to her home port in Sydney.  A visit by Earl Mountbatten of Burma was a highlight at this time – especially when, after his presentation to the ship's company, they were all granted a 'make and mend.'

[[File:RAN Carriers (AWM 301021).jpg|thumb|left|alt=Photograph of an aircraft carrier from behind. Numerous aircraft with their wings folded are sitting on the flight deck. A second aircraft carrier is in the background, leading the first.|''Sydney'' (background) escorting ''Melbourne'' (foreground) during the final leg of the latter's delivery voyage]]
On 1 May 1956, ''Sydney'' met ''Melbourne'' off [[Kangaroo Island]] during the latter's delivery voyage.<ref name=Hall73>Hall, ''HMAS Melbourne'', p. 73</ref> The two carriers sailed together for the remainder of ''Melbourne''{{'}}s delivery voyage, visiting Melbourne and Jervis Bay before arriving in Sydney on 10 May.<ref name=Hall74>Hall, ''HMAS Melbourne'', p. 74</ref> Three days later, the flagship role was transferred from ''Sydney'' to ''Melbourne''.<ref name=Hall74/> After this, ''Sydney'' continued on a program of training cruises throughout Australian and New Zealand waters, and visited the [[Far East Strategic Reserve]] to participate in a [[South East Asia Treaty Organisation]] multi-fleet exercise during September and October 1956.<ref name=Cassells174/> Following an appraisal process by the RAN, during which ''Sydney''{{'}}s potential usefulness as a [[commando carrier]], aircraft transport, or troopship was considered, the ship was paid off into Special Reserve on 30 May 1958 as surplus to requirements.<ref name=Cassells174/><ref name=Grey100>Grey, ''Up Top'', p. 100</ref> ''Sydney'' could be reactivated for use as a transport, but required at least four months notice.<ref name=Grey100/>

===Fast Troop Transport (1958–1965) conversion===
From 1958 to 1960, opinion within the Australian military swung between reactivating ''Sydney'' as a fast troop transport ship and disposing of her.<ref name=Grey100/> The [[Australian Army]] saw the need for such a vessel, particularly if war broke out in Southeast Asia: Australian forces would need to be rapidly deployed to the conflict, and [[sealift]] was the only way to effectively move the required number of personnel, equipment, and vehicles.<ref name=Grey100.1>Grey, ''Up Top'', pp. 100–1</ref> However, the RAN did not want the cost of converting and maintaining ''Sydney'' coming from their share of the defence budget, as they felt there was no further use for her.<ref name=Grey100.1/> As both [[strategic airlift]] and sealift with other naval or civilian vessels were unfeasible, ''Sydney'' was reactivated and converted into a fast troop transport ship during 1961 and 1962.<ref name=Cooper.opp160/><ref name=Grey102>Grey, ''Up Top'', p. 102</ref> All of her aircraft operating equipment was removed, her hangar was converted into accommodation and storage, and her armament was reduced to four single-mounted [[Bofors 40 mm Automatic Gun L/60|40&nbsp;mm Bofors]].<ref name=Cooper.opp160/><ref name=Gillett78/> ''Sydney'' was recommissioned as a Fast Troop Transport on 7 March 1962, given the pennant number A214, and assigned back to the training squadron.<ref name=Cassells174/><ref name=Gillett78>Gillett, ''Australian and New Zealand Warships since 1946'', p. 78</ref> From April 1962 onwards, ''Sydney'' was used to train the ship's company and Army personnel for the troop transport role, while supplementing the RAN's regular training needs.<ref name=Grey102/> The troopship first saw full use in her new role in August 1963, when she was used to support an amphibious landing at [[Hervey Bay]], Queensland during Exercise Carbine.<ref name=GillettWOA131/>

====Whitsunday tragedy====
From 27 September to 4 October, ''Sydney'' conveyed the [[Governor-General of Australia]], [[William Sidney, 1st Viscount De L'Isle|Viscount De L'Isle]], on a tour of [[Norfolk Island|Norfolk]] and [[Lord Howe Island]]s.<ref name=Bastock305>Bastock, ''Australia's Ships of War'', p. 305</ref> The ship then departed on a training cruise to northern Queensland, during which five personnel drowned in the [[Whitsunday Islands]].<ref name=Bastock305/><ref name=FrameWFC37>Frame, ''Where Fate Calls'', p. 37</ref> Over several days, groups of trainee officers and sailors had been ordered to take one of the ship's whaleboats on a twelve-hour voyage around [[Hayman Island|Hayman]] and Hooke Islands; out of the sight of both the carrier and her escort, the destroyer {{HMAS|Anzac|D59|6}}.<ref name=FrameWFC37/> The third group boat left ''Sydney'' at around 0500 hours on 17 October with a midshipman and four trainee sailors aboard, and was believed to have capsized four to five hours later.<ref name=Bastock305/><ref name=FrameWFC37/> Despite poor weather, ''Sydney''{{'}}s captain had declined an offer by ''Anzac''{{'}}s captain for the destroyer to move to the north of Hayman Island in case of incident, and a search party was not sent until after the boat failed to return at 1900 hours.<ref name=FrameWFC37/> A Board of Inquiry was held aboard ''Sydney'', which resulted in the ship's captain, executive officer, and training officer facing [[courts-martial]].<ref>Frame, ''Where Fate Calls'', pp. 37–8</ref> The latter two were acquitted, and although the captain was found guilty on one of the charges brought against him, it was dropped on a technicality relating to the wording of the charge.<ref>Frame, ''Where Fate Calls'', p. 38</ref>

===First overseas deployment as a transport===
''Sydney''{{'}}s first overseas deployment as a transport was to Southeast Asia in 1964.<ref name=Cooper.opp160/> In late May, the ship was loaded with supplies and munitions for Malaysian forces in support of the country's [[Indonesia–Malaysia confrontation|defence policy against Indonesia]].<ref name=Cooper.opp160/><ref name=Pfennig159.60>Pfennigwerth, ''Tiger Territory'', pp. 159–60</ref> In total, 1,245 personnel were also embarked: engineers from the [[7th Field Squadron]], the Royal Australian Artillery's [[111th Air Defence Battery, Royal Australian Artillery|111th Light Anti-aircraft Battery]], and four [[UH-1 Iroquois]] helicopters plus associated air- and ground crew from [[No. 5 Squadron RAAF]].<ref name=Pfennig160>Pfennigwerth, ''Tiger Territory'', p. 160</ref> ''Sydney'' departed Garden Island just after midnight on 24 May.<ref name=Pfennig160/> After entering New Guinea waters, the ship was put on high alert; radio and radar silence was enforced, while the anti-aircraft guns of the 111th Battery were secured to the ship's deck to supplement her armament.<ref name=Pfennig160/> ''Sydney'' met the destroyer escorts {{HMAS|Yarra|DE 45|2}} and {{HMAS|Parramatta|DE 46|2}} off the Philippines on 3 June, and a day later, the ships arrived at [[Kota Kinabalu]], where the 7th Field Squadron was offloaded with the aid of the Australian Army landing ships {{ship|Australian landing ship medium|Vernon Sturdee|AV 1355|2}} and {{ship|Australian landing ship medium|Clive Steele|AV 1356|2}}.<ref name=Pfennig159.60/> ''Sydney'' and her companions left for Singapore at midnight on 5 June, and arrived three days later to offload 250 tonnes of ammunition.<ref name=Pfennig161>Pfennigwerth, ''Tiger Territory'', p. 161</ref> ''Sydney'' and ''Parramatta'' then proceeded to [[Penang]], where the 111th Battery, No. 5 Squadron, defence stores, and more munitions were offloaded during 16–17 June.<ref name=Pfennig161/> The return voyage to Australia was interrupted on the morning of 23 June by the detection of a suspected Indonesian submarine: the two Australian ships performed evasion tactics for eighteen hours before resuming the voyage to Fremantle.<ref name=Pfennig161/> No awards were issued to ''Sydney'' for operating in support of Malaysia during her service life, but a reorganisation of RAN battle honours published in March 2010 saw the battle honour "Malaysia 1964" retroactively awarded to the ship.<ref name=honourslist>Royal Australian Navy, ''Royal Australian Navy Ship/Unit Battle Honours''</ref><ref>Royal Australian Navy, ''Navy Marks 109th Birthday With Historic Changes To Battle Honours''</ref>

===Vietnam War (1965–1972)===
{{See also|Military history of Australia during the Vietnam War}}
The main feature of the second half of ''Sydney''{{'}}s career was the twenty-five voyages the ship made to South Vietnam in support of the [[1st Australian Task Force]] between May 1965 and November 1972.<ref>Nott & Payne, ''The Vung Tau Ferry'', pp. 169–78</ref>{{efn|Other sources give a smaller number of voyages to Vietnam by ''Sydney''. The 25-voyage figure and the associated dates are taken from Section s5B(2)(c) of the Veterans Entitlement Act.<ref name=NottPayne169/> The smaller figures come from treating the fifth and sixth visits to Vũng Tàu as a single voyage because ''Sydney'' did not return to Australia in between, not including the twenty-fifth voyage because it was not directly part of Australia's war effort, or discounting the nineteenth and twenty-fifth voyages because ''Sydney'' did not carry Australian troops or equipment.}} ''Sydney'', along with the civilian vessels {{HMAS|Jeparit||2}} and {{HMAS|Boonaroo||2}}, was used to transport the majority of the Australian personnel and equipment contributed to the Vietnam War effort.<ref>Cooper, in ''The Royal Australian Navy'', pp. 204–5</ref> These voyages earned ''Sydney'' the nickname "Vung Tau Ferry".<ref name=Coop204/> The visits to Vietnam were interspersed by other duties, and ''Sydney'' continued to function as a training ship, with up to 30 [[midshipmen]] and 200 trainee sailors aboard at any given time.<ref name=Cassells174/><ref name=Grey108/>

{{Location map+ |Vietnam |alt=Map of Vietnam, showing its location in the Southeast Asian region. Two red dots mark the locations of Vung Tau and Saigon: the former is the location Sydney sailed to on transport voyages, the latter was the original destination, and is included for reference |float=right |width=180 |caption=A map of Vietnam, showing its location in Southeast Asia. The port of Vũng Tàu (marked) was ''Sydney''{{'}}s destination for all twenty-five voyages to Vietnam. |places=
{{Location map~|Vietnam |lat_deg=10|lat_min=35|lat_sec=28|lat_dir=N|lon_deg=107|lon_min=15|lon_sec=5|lon_dir=E|position=right|label=Vũng Tàu|marksize=5}}
{{Location map~|Vietnam |lat_deg=10|lat_min=46|lat_sec=10|lat_dir=N|lon_deg=106|lon_min=40|lon_sec=55|lon_dir=E|position=left|label=Saigon|marksize=5}}}}
[[File:Vehicles on deck of HMAS Sydney.jpg|thumb|right|Vehicles on flight deck during first voyage to South Vietnam in June 1965]]
[[File:HMAS Sydney (R17) offloading at Vung Tau.jpg|thumb|''Sydney'' offloading at Vung Tau in June 1965]]
''Sydney'' normally transported 450 soldiers—the main force of a [[Royal Australian Regiment]] (RAR) battalion—plus equipment and vehicles on each voyage.<ref name=Fairfax166>Fairfax, ''Navy in Vietnam'', p. 166</ref> The soldiers were accommodated in the sailors mess decks, with the sailors displaced to the hangar.<ref name=Fairfax166/> Vehicles were secured to the flight deck, while other cargo was packed onto pallets and stored either in the hangar or on the flight deck.<ref name=Fairfax166/> Although it was originally intended that ''Sydney'' would sail to and from [[Saigon]], the ship's commanding officer at the time of the first voyage, [[John Crabb (admiral)|John Crabb]], informed the Naval Board that he would refuse orders to do so, as the [[Saigon River]] could easily be mined after ''Sydney'' had sailed up.<ref>Crabb, quoted in Nott & Payne, ''The Vung Tau Ferry'', p. 55</ref> Instead, the port of [[Vũng Tàu]] was selected as the destination, with soldiers and equipment transferred to shore by helicopters, landing craft, and barges.<ref name=Merson59.60>Merson, quoted in Nott & Payne, ''The Vung Tau Ferry'', pp. 59–60</ref> During the early voyages, unloading and reloading was a multiple-day process, with the transport moving to deeper waters each night, but improved cargo handling practices, upgrades to ''Sydney'' (including the installation of three new cargo cranes and six embarked [[landing craft]] during mid-1968 refit), and increased access to US cargo- and troop-carrying helicopters, reduced this to a single day by 1968.<ref name=Merson59.60/><ref>Grey, ''Up Top'', pgs. 109, 111</ref><ref name="Cecil_25">Cecil, ''Mud & Dust'', p. 25</ref>

Because of the perceived threat from Chinese submarines while in transit and from [[Viet Cong]] swimmers with [[Naval mine#Limpet mines|limpet mines]] while in harbour, ''Sydney'' was always escorted by at least one other RAN vessel.<ref name=Coop204/><ref name=NottPayne59>Merson, quoted in Nott & Payne, ''The Vung Tau Ferry'', p. 59</ref> While in harbour, boats from ''Sydney'' and her escort would patrol around the troopship, while divers regularly inspected the hull, propellers, and anchor chain for explosives.<ref name=NottPayne60>Merson, quoted in Nott & Payne, ''The Vung Tau Ferry'', p. 60</ref> On seven voyages, ''Sydney'' carried four [[Westland Wessex]] helicopters for anti-submarine surveillance, sourced from [[725 Squadron RAN|725]] or [[817 Squadron RAN|817 Squadron]].<ref name=Coop204/><ref name=NottPayne33/>

During May 1965, ''Sydney'' was undergoing a refit at Garden Island, when she was ordered to prepare the ship for her first voyage to Vietnam.<ref name=Grey104>Grey, ''Up Top'', p. 104</ref> The refit was hastily completed, and cargo loading started on 23 May.<ref name=Grey104/> A blanket media ban concerning the ship was issued, and soldiers of [[1st Battalion, Royal Australian Regiment]] (1 RAR) and the [[4th/19th Prince of Wales's Light Horse|Prince of Wales's Light Horse]] armoured regiment, along with a logistics unit and a group of journalists were covertly transported to the ship on 26 May to foil any protest attempts.<ref name=Ham128>Ham, ''Vietnam'', p. 128</ref><ref>Grey, ''Up Top'', pp. 104–5</ref> ''Sydney'' began her departure at 01:39; leaving Sydney Harbour with only her navigational lights lit.<ref name=Ham128/> The troopship was in Vũng Tàu from 8 to 11 June, and returned to Fremantle on 26 June.<ref name=NottPayne169>Nott & Payne, ''The Vung Tau Ferry'', p. 169</ref> ''Sydney'' was escorted by the destroyer {{HMAS|Duchess|D154|2}} for the entire voyage, and was joined by HMA Ships {{HMAS|Parramatta|DE 46|2}}, {{HMAS|Melbourne|R21|2}}, and {{HMAS|Vampire|D11|2}} for parts of the voyage.<ref name=NottPayne169/> After loading troops and equipment in both Sydney and Brisbane, the troopship, accompanied by ''Melbourne'' and ''Anzac'', started her second voyage on 14 September.<ref name=NottPayne170>Nott & Payne, ''The Vung Tau Ferry'', p. 170</ref><ref name=Grey106>Grey, ''Up Top'', p. 106</ref> ''Sydney'' was handed off to ''Duchess'' and {{HMAS|Vendetta|D08|2}} off [[Manus Island]] six days later.<ref name=NottPayne170/><ref name=Grey106/> The three ships reached Vũng Tàu on 28 September, and departed two days later: after clearing the [[Market Time]] area, the two destroyers headed for Hong Kong, while ''Sydney'' proceeded to [[Subic Bay]], then to her namesake city, where she arrived on 20 October.<ref name=NottPayne170/><ref name=Grey106/> Despite these deployments, ''Sydney'' was later presented the [[Gloucester Cup (RAN)|Gloucester Cup]] for 1966; being the most efficient vessel in the RAN that year.<ref>Crabb, quoted in Nott & Payne, ''The Vung Tau Ferry'', p. 56</ref>

''Sydney'' sailed to Vietnam for the third time on 24 April 1966, with units from both [[5th Battalion, Royal Australian Regiment|5 RAR]] and [[6th Battalion, Royal Australian Regiment|6 RAR]] aboard.<ref name=Grey108>Grey, ''Up Top'', p. 108</ref><ref name=NottPayne170/>{{efn|The departure date listed in Section s5B(2)(c) of the Veterans Entitlement Act conflicts with the ship's records: the latter gives ''Sydney''{{'}}s departure date for the third voyage as 22 April.<ref name=NottPayne169/>}} She met her escorts, ''Vampire'', {{HMAS|Yarra|DE 45|2}}, and ''Melbourne'' en route: the two smaller ships accompanied ''Sydney'' into Vũng Tàu from 4 to 6 May, while the aircraft carrier ''Melbourne'' left the group as soon as they reached the Vietnam operational area.<ref name=NottPayne170/> ''Sydney'' and her escorts arrived in Hong Kong on 9 May, with the troopship returning to Sydney on her own on 18 May.<ref name=NottPayne170/> On 25 May, ''Sydney'' departed on her fourth voyage to Vietnam, with the remaining units of 5 RAR and 6 RAR aboard, plus equipment and personnel of [[No. 9 Squadron RAAF]].<ref name=Grey108/><ref name=NottPayne171>Nott & Payne, ''The Vung Tau Ferry'', p. 171</ref>{{efn|The departure date listed in Section s5B(2)(c) of the Veterans Entitlement Act conflicts with the ship's records: the latter gives ''Sydney''{{'}}s departure date for the fourth voyage as 24 May.<ref name=NottPayne169/>}} Carrying the remaining units of 5 RAR and 6 RAR, plus equipment and personnel of No. 9 Squadron RAAF and escorted by ''Yarra'', ''Melbourne'', ''Derwent'', and ''Vendetta'' for varying sections of the voyage, ''Sydney'' arrived in Vũng Tàu on 6 June.<ref name=Grey108/><ref name=NottPayne171/> The voyage officially ended with the arrival of ''Sydney'' and ''Vendetta'' in Hong Kong on 11 June.<ref name=NottPayne171/> In November, ''Sydney'' provided assistance to the submarine {{USS|Tiru|SS-416|6}}, which ran aground on [[Frederick Reef]].<ref name=Cassells174/>

On 1 March 1967, the [[Ensign (flag)|ensign]] flown by RAN ships was changed from the British [[White Ensign]] to the [[Australian White Ensign]].<ref>''Australian White Ensign'', Sea Power Centre</ref> ''Sydney'' became one of only two RAN ships to undergo wartime service under both ensigns—the other being {{HMAS|Vendetta|D08|2}}—and the only RAN ship to fly two ensigns during the same conflict.<ref name=Fairfax169>Fairfax, ''Navy in Vietnam'', p. 169</ref> With [[7th Battalion, Royal Australian Regiment|7 RAR]] embarked, ''Sydney'' departed her namesake city on 8 April for her fifth voyage to Vietnam.<ref name=NottPayne171/> With ''Vampire'' escorting and Westland Wessex helicopters aboard for the first time, the troopship spent 20 April disembarking 7 RAR in Vũng Tàu before arriving in Singapore two days later.<ref name=NottPayne33/><ref name=NottPayne171/> On 28 April, the two ships left Singapore on the sixth voyage, to collect 5 RAR.<ref name=NottPayne172>Nott & Payne, ''The Vung Tau Ferry'', p. 172</ref> The battalion was embarked on 30 April, with ''Sydney'' arriving home on 12 May.<ref name=NottPayne172/> Although the fifth and six voyages are officially recorded separately, they are sometimes counted as a single trip, because ''Sydney'' did not return to Australia in between.<ref name=Grey108/><ref name=NottPayne59/>

''Sydney''{{'}}s seventh voyage began on 19 May from Brisbane, with [[2nd Battalion, Royal Australian Regiment|2 RAR]] and a company from 1st Battalion, [[Royal New Zealand Infantry Regiment]]—the first New Zealand infantry force sent to Vietnam.<ref name=NottPayne172/><ref name=Macdougall337>MacDougall, ''Australians at War'', p. 337</ref> ''Sydney'' and the destroyer escort ''Stuart'' reached Vũng Tàu on 30 May, where the troopship's passengers were offloaded by [[Boeing CH-47 Chinook|Chinook]] helicopters and replaced by 6 RAR.<ref name=NottPayne172/><ref name=Macdougall337/> The ships left Vietnam on the same day, and arrived in Brisbane on 14 June.<ref name=NottPayne172/> The eighth voyage required ''Sydney'' to transport [[3rd Battalion, Royal Australian Regiment|3 RAR]] from Adelaide.<ref name=NottPayne172/> Departing on 20 December, ''Sydney'' was met by ''Yarra'' en route, with the two ships arriving in Vietnam on 27 December, and returning to Fremantle on 3 January 1968.<ref name=NottPayne172/>

On 17 January 1968, ''Sydney'' departed Sydney on her ninth voyage to Vietnam.<ref name=NottPayne173>Nott & Payne, ''The Vung Tau Ferry'', p. 173</ref> Meeting ''Stuart'' off Singapore on 25 January, the two ships visited [[Sattahip, Thailand]] on 31 January before continuing on to Vietnam.<ref name=NottPayne173/> ''Sydney'' arrived in Vũng Tàu on 3 February, and departed the same day for home; arriving in Sydney on 16 February.<ref name=NottPayne173/> ''Sydney''{{'}}s tenth voyage began on 27 March, with 1 RAR embarked for their second Vietnam deployment, and the destroyer escort ''Parramatta'' meeting the troopship off Singapore.<ref name=NottPayne173/><ref>Lind, ''The Royal Australian Navy'', p. 261</ref> The battalion was delivered to Vũng Tàu on 9 April, with 7 RAR on board for the return to Australia, where they arrived on 26 April.<ref name=NottPayne173/> The eleventh voyage saw ''Sydney'', with the destroyer ''Anzac'' escorting, depart Brisbane on 21 May with [[4th Battalion, Royal Australian Regiment|4 RAR]] aboard.<ref name=NottPayne173/> The ships arrived at Vũng Tàu on 1 June, where the battalion was replaced by 2 RAR for the return voyage to Brisbane, which was reached on 13 June.<ref name=NottPayne173/> After this voyage, ''Sydney'' underwent an extensive refit in which she was fitted with three new [[Favelle Favco]]-type cargo cranes and modified to carry six [[Landing Craft Mechanized]] (LCM (6)) on davits.<ref name=GillettWOA131>Gillett, ''Warships of Australia'', p. 131</ref><ref name="Cecil_25" /><ref name=andrews8>Andrews, ''Fighting Ships of Australia & New Zealand'', p. 8</ref> 16 LCM were constructed for use with ''Sydney'', but half were put up for sale in the early 1970s.<ref name=andrews8/> During September and October, ''Sydney'' temporarily resumed flagship duties, and participated in the amphibious warfare exercise Coral Sands.<ref name=Bastock305/> After the exercise, the troopship undertook a training cruise to New Zealand.<ref name=Bastock305/> ''Sydney''{{'}}s twelfth voyage was to deliver [[9th Battalion, Royal Australian Regiment|9 RAR]] to Vietnam.<ref name=NottPayne174>Nott & Payne, ''The Vung Tau Ferry'', p. 174</ref> The troopship sailed from Fremantle on 13 November, and met the destroyer ''Duchess'' off Singapore on 18 November.<ref name=NottPayne174/> 9 RAR was delivered to Vũng Tàu on 20 November, while 3 RAR and a damaged [[de Havilland Canada DHC-4 Caribou|de Havilland Caribou]] were loaded for the return trip, which concluded in Fremantle on 28 November.<ref name=Grey108/><ref name=NottPayne174/>

At the start of 1969, the RAN's ship designation and numbering system was altered from the [[Pennant number|British pennant system]] to a new system based on the United States' [[Hull classification symbol|hull classifications]]: ''Sydney'' was assigned the pennant number P214.<ref name=Gillett78/><ref>Jones, in Stevens, ''The Royal Australian Navy'', p. 213</ref> The troopship began her thirteenth voyage on 8 February 1969, when she sailed from Fremantle with 5 RAR aboard.<ref name=NottPayne174/> ''Sydney'' and the destroyer escort ''Derwent'' arrived in Vũng Tàu on 15 February and departed the same day with 1 RAR embarked, with the troopship reaching Townsville on 25 February.<ref name=Grey108/><ref name=NottPayne174/> A training cruise in March saw the ship visit New Zealand and Fiji.<ref name=Bastock305/> ''Sydney''{{'}}s fourteenth voyage, to deliver 6 RAR to Vietnam and return with 4 RAR, commenced on 8 May when ''Sydney'' sailed from Townsville.<ref name=NottPayne174/> She met the destroyer ''Vampire'' off Singapore on 14 May, reached Vũng Tàu five days later, and arrived back in Brisbane on 30 May.<ref name=NottPayne174/> On 17 November, ''Sydney'' and the destroyer ''Duchess'' departed Brisbane on the troopship's fifteenth voyage to Vietnam, with [[8th Battalion, Royal Australian Regiment|8 RAR]] aboard.<ref name=NottPayne175>Nott & Payne, ''The Vung Tau Ferry'', p. 175</ref> The ships reached Vũng Tàu on 28 November; 8 RAR was replaced by 9 RAR, which was delivered to Fremantle on 5 December.<ref name=NottPayne175/>

''Sydney'', with 7 RAR on board, and the destroyer escort ''Yarra'' departed from Sydney for the sixteenth voyage on 16 February 1970.<ref name=NottPayne175/> They arrived in Vietnam on 27 February, with ''Sydney'' embarking 5 RAR for the voyage to Fremantle, where they arrived on 5 March.<ref name=NottPayne175/> On 16 April, ''Sydney'' was one of 45 vessels from 13 nations assembled in Sydney Harbour to celebrate the [[Australian Bicentenary]], marking [[James Cook]]'s discovery of the east coast of Australia.<ref>Lind, ''The Royal Australian Navy'', pp. 274–5</ref> Later that month, a visit to [[Portland, Victoria]] coincided with the Bicentenary [[Royal visits to Australia|Royal Tour]] of Queen Elizabeth II and the [[Prince Philip, Duke of Edinburgh|Duke of Edinburgh]].<ref name=Bastock305/> ''Sydney'' sailed from Fremantle on 21 October on the seventeenth voyage to Vietnam.<ref name=NottPayne175/> The troopship met the destroyer ''Vendetta'' off Manila, and reached Vietnam on 31 October, where 2 RAR was offloaded and 8 RAR embarked.<ref name=Grey108/><ref name=NottPayne175/> The two ships departed a day later, with ''Sydney'' reaching Brisbane on 12 November.<ref name=NottPayne175/> At the start of February 1971, the troopship visited Hobart to serve as the flagship of the [[Royal Hobart Regatta]], before she sailed to Adelaide, embarked 3 RAR, then departed on her eighteenth Vietnam voyage on 15 February.<ref name=Bastock305/><ref name=NottPayne176>Nott & Payne, ''The Vung Tau Ferry'', p. 176</ref> ''Sydney'' met the destroyer escort ''Yarra'' en route, with both ships reaching Vũng Tàu on 25 February, where 7 RAR boarded for the return voyage.<ref name=NottPayne176/> On 2 March, two days before reaching Fremantle, the ashes of Rear Admiral [[Harold Farncomb]] were scattered from ''Sydney''.<ref name=Bastock305/><ref name=NottPayne176/>

[[File:A4 lands on melbourne.jpg|thumb|''Sydney'' collected ten A-4G Skyhawks from the United States for use by the [[Fleet Air Arm (RAN)|Fleet Air Arm]] in July 1971.<ref>{{cite web|url=http://www.adf-serials.com/n13.shtml|title=ADF Aircraft Serial Numbers N13 RAN Douglas A-4G Skyhawk|last=Crick|first=Darren|year=2008|work=ADF Serials|access-date=8 March 2010|archive-date=9 June 2009|archive-url=https://web.archive.org/web/20090609172721/http://www.adf-serials.com/n13.shtml|url-status=dead}}</ref> The aircraft were never flown from ''Sydney'', but used by sister ship ''Melbourne''.|alt=A jet aircraft with red and white markings and the word "Navy" on its tail lands on the grey deck. Smoke rises from the front tire. Water can be seen in the background.]]
''Sydney'' sailed again from Adelaide on 26 March for her nineteenth voyage, carrying general cargo and foreign aid supplies for the [[Khmer Republic]].<ref name=Grey108/><ref name=NottPayne176/> She met the destroyer ''Duchess'' off Singapore on 3 April, and the two ships arrived in Vũng Tàu on 5 April.<ref name=NottPayne176/> The voyage officially ended when ''Sydney'' and ''Duchess'' arrived in Hong Kong on 8 April, and after a short period of recreational leave, the troopship returned to Australia.<ref name=NottPayne176/><ref name=Bastock306>Bastock, ''Australia's Ships of War'', p. 306</ref> The twentieth voyage saw ''Sydney'' sail from Townsville on 13 May, with 4 RAR embarked.<ref name=NottPayne176/> She met ''Duchess'' and ''Parramatta'' en route, and reached Vũng Tàu on 22 May.<ref>Nott & Payne, ''The Vung Tau Ferry'', pp. 176–7</ref> The ships left a day later, with 2 RAR aboard for the voyage home.<ref name=NottPayne176/> ''Sydney'' arrived in Townsville on 1 June.<ref name=NottPayne176/> In July 1971, ''Sydney'' sailed to [[Esquimalt, British Columbia]], for Canada's centennial naval assembly.<ref name=Cassells174/> She then visited San Diego to collect ten new [[McDonnell Douglas A-4G Skyhawk|A-4G Skyhawk]] aircraft for the Fleet Air Arm, and delivered these to Australia in mid-August.<ref name=Bastock306/> On 20 September, ''Sydney'' departed on the twenty-first voyage to Vietnam.<ref name=NottPayne177>Nott & Payne, ''The Vung Tau Ferry'', p. 177</ref> The troopship first sailed to Singapore, where she offloaded equipment for the [[ANZUK]] force and met the destroyer escort ''Swan''.<ref name=NottPayne177/><ref name=Cassells175>Cassells, ''The Capital Ships'', p. 175</ref> The two ships were in Vũng Tàu for 6–7 October, during which 3 RAR was heli-lifted to ''Sydney'' for return to Australia, with the troopship arriving in Adelaide on 16 October.<ref name=NottPayne177/><ref>Ham, ''Vietnam'', p. 555</ref> Ten days later, ''Sydney'' sailed from her namesake city for her twenty-second visit to Vietnam, with a cargo of Defence Aid stores.<ref name=NottPayne177/> Meeting the destroyer escort ''Derwent'' en route, ''Sydney'' arrived in Vũng Tàu on 6 November, where the stores were offloaded and replaced by Australian personnel and equipment from assorted units over a two-day period.<ref name=NottPayne177/> Arriving back in Sydney, the troopship left again on 24 November for her twenty-third voyage to Vietnam.<ref name=NottPayne178>Nott & Payne, ''The Vung Tau Ferry'', p. 178</ref> ''Sydney'' met ''Swan'' off Subic Bay, then arrived in Vũng Tàu on 8 December, where 4 RAR, the 104th Battalion of the [[Royal Australian Artillery]], and No. 9 Squadron were embarked for the return to Australia.<ref name=Fairfax169/><ref name=NottPayne178/> The ship was visited by South Vietnamese President [[Nguyễn Văn Thiệu]] before departing, who thanked the efforts of the Australian military during the Vietnam War.<ref name=Fairfax169/> ''Sydney'' arrived in Townsville on 17 December.<ref name=NottPayne178/>

''Sydney'' left for her twenty-fourth voyage to Vietnam on 14 February 1972; the troopship and the destroyer escort {{HMAS|Torrens|DE 53|2}} reached Vũng Tàu on 28 February, where 457 Australian soldiers from various units boarded.<ref name=NottPayne178/> They left the next day, and ''Sydney'' reached Townsville on 9 March before arriving in her namesake city three days later, concluding the military involvement of the RAN in the Vietnam War.<ref name=NottPayne178/><ref>Lind, ''The Royal Australian Navy'', p. 285</ref> ''Sydney'' underwent a refit between 22 May and 20 October, then departed on 1 November for her twenty-fifth journey to Vietnam, carrying defence equipment and foreign aid supplies for South Vietnam and the Khmer Republic.<ref name=Coop204/><ref name=Cassells175/><ref name=NottPayne178/> ''Sydney'' and the destroyer ''Vampire'' reached Vũng Tàu on 23 November, and sailed a day later with miscellaneous Australian equipment aboard.<ref name=NottPayne178/> During the return voyage, ''Sydney'' encountered the disabled merchant ship ''Kaiwing'', and towed her {{convert|450|nmi}} to Hong Kong for repairs, arriving on 30 November.<ref name=Cassells175/><ref name=NottPayne178/>

During her voyages to South Vietnam, ''Sydney'' transported 16,902 soldiers, 5,753 [[deadweight ton]]s of cargo, 2,375 vehicles, and 14 aircraft.<ref>Grey, ''Up Top'', p. 107</ref> Initially, personnel from ''Sydney'', the other transport ships, and their escorts, could not claim time served on logistics or escort deployments towards the active service requirements of the [[Vietnam Medal]], the [[Australian Active Service Medal 1945-1975|Australian Active Service Medal]], or the [[Returned From Active Service Badge]]: the Department of Defence had attempted to limit the cost of repatriation benefits by taking the stance that these ships were not eligible as they were not in combat.<ref name=NottPayne115>Nott & Payne, ''The Vung Tau Ferry'', p. 115</ref><ref>Grey, ''Up Top'', p. 117</ref> Following numerous campaigns to change this, the Australian government issued the Returned from Active Service Badge to all these personnel in 1986, and allowed them to receive military service pensions.<ref>Nott & Payne, ''The Vung Tau Ferry'', pp. 116–7</ref> Further campaigning and legal challenges resulted in the creation of the [[Vietnam Logistic and Support Medal]] in 1992, which was presented as a [[campaign medal]] to personnel who did not meet the requirements for the Vietnam Medal, but were still involved in the conflict.<ref>Nott & Payne, ''The Vung Tau Ferry'', pp. 118–9</ref> Similar efforts were made to have ''Sydney''{{'}}s service recognised with a battle honour: according to Nott and Payne, such a battle honour is yet to be awarded as of 2008,<ref>Nott & Payne, ''The Vung Tau Ferry'', p. 25</ref> although a 2006 Department of Defence press release lists the honour "Vietnam 1965–72" among those awarded to the ship.<ref name=nextgen>Department of Defence, ''Next generation of naval ships to reflect a rich history of service'' [press release]</ref> The battle honour was confirmed in an updated list released in March 2010.<ref name=honourslist/>

==Final years, decommissioning and fate==
The ship was assigned the pennant number L134 during 1973.<ref name=Gillett78/> At the start of the year, ''Sydney'' was marked for a potential deployment to [[Mururoa]] in support of a Royal New Zealand Navy frigate sent to protest [[France and weapons of mass destruction#Testing|French nuclear testing]] at the atoll.<ref>Frame & Baker, ''Mutiny!'', pp. 236–7</ref> The former carrier was chosen as she was capable of [[Replenishment at Sea|replenishing]] smaller vessels, and the RAN's dedicated [[replenishment oiler]], {{HMAS|Supply|AO 195|6}}, was undergoing refits.<ref>Frame & Baker, ''Mutiny!'', p. 237</ref> The Australian government did not want to send a warship until all other avenues of protest had been exhausted; the length of this delay meant ''Supply''{{'}}s refit was finished before ''Sydney'' was deployed, and the oiler was sent instead.<ref>Frame & Baker, ''Mutiny!'', p. 242</ref> ''Sydney'' visited Singapore in March, returned to Australia, and sailed to New Zealand in April: she participated in training exercises during both visits.<ref name=SPC/><ref name=Cassells175/> The troopship was then involved in a [[joint warfare]] exercise in Jervis Bay during May.<ref name=Bastock306/>

[[File:Naval Chapel GI Mel-Syd.JPG|thumb|right|alt=Two tall stained glass windows. The left window shows an aircraft carrier about to launch an aircraft, while the right depicts two cruisers and an aircraft carrier at sea. A memorial plaque sits between the windows.|Memorial windows for the first three [[HMAS Sydney|HMA Ships ''Sydney'']] (right) and the carrier {{HMAS|Melbourne|R21|6}} (left)]]
On 20 July 1973, the Australian government decided that ''Sydney'' was to be decommissioned.<ref>Lind, ''The Royal Australian Navy'', p. 286</ref> A refit planned to start late in the year was cancelled, and on 12 November 1973, ''Sydney'' was paid off and marked for disposal.<ref name=Gillett78/> The ship had sailed {{convert|711549|nmi}} since she was first commissioned: {{convert|315958|nmi}} as an aircraft carrier, and {{convert|395591|nmi}} as a fast troop transport.<ref name=SPC/> Several suggestions for disposal were made by various companies and agencies.<ref name=Cassells175/> The [[Geelong]] Regional Tourist Authority wanted the ship moored in [[Corio Bay]] for use as a maritime museum, convention centre, and floating casino.<ref name=Cassells175/> The Naval History Society of Australia suggested that the island superstructure be removed and located in [[The Rocks, New South Wales|The Rocks]] as a maritime museum, while the owners of the [[Sydney Opera House]] planned to use the ship as a floating car park.<ref name=Cassells175/> [[Request for tender|Tenders]] closed on 7 October 1975, and the ship was sold on 30 October for breaking up as scrap metal to the Dongkuk Steel Mill in Seoul, South Korea, for A$673,516.<ref name=GillettWOA131/> ''Sydney'' was towed from her namesake city by a Japanese tugboat on 23 December 1975, leaving at 1300 hours.<ref name=GillettWOA131/>

''Sydney'' had been originally slated for replacement in the 1960s, with rumours circulating that the new ship would either be an [[amphibious assault ship]] of the United States {{sclass|Iwo Jima|amphibious assault ship|4}}, or the British carrier {{HMS|Hermes|R12|6}}.<ref name=andrews8/><ref name=Lind260>Lind, ''The Royal Australian Navy'', p. 260</ref> The assault ship rumour was proven false by the early 1970s, while the acquisition of ''Hermes'' was still under discussion in the 1980s as a possible [[HMAS Melbourne (R21)#Replacement|replacement for sister ship HMAS ''Melbourne'']].<ref name=andrews8/><ref name=Lind260/> Following the decommissioning of ''Sydney'', the Australian Defence Force did not possess a long-range troop transportation capability until the modified {{sclass2|Round Table|landing ship logistics|0}} landing ship {{HMAS|Tobruk|L 50|6}} was commissioned in 1981.<ref>Frame, ''No Pleasure Cruise'', pp. 260–1</ref>

The ship's service, along with the [[HMAS Sydney|previous two ships of the name]], is commemorated by a stained-glass window at the [[Naval Chapel, Garden Island NSW|Garden Island Naval Chapel]]. The carrier's chapel and bell were removed and installed at the naval base {{HMAS|Moreton}} in 1974, then were relocated to the [[Australian National Maritime Museum]]'s collection in the 1980s.<ref name=Cassells178>Cassells, ''The Capital Ships'', p. 178</ref> One of ''Sydney''{{'}}s anchors is displayed at the [[Fleet Air Arm Museum (Australia)|Fleet Air Arm Museum]] at {{HMAS|Albatross|air station|6}}.<ref name=Cassells178/>

==Footnotes==
{{notelist}}

==Citations==
{{reflist}}

==References==
===Books===
*{{cite book |author=Australian Naval Aviation Museum (ANAM) |title=Flying Stations: a story of Australian naval aviation |year=1998 |publisher=Allen & Unwin |location=St Leonards, NSW |isbn=1-86448-846-8 |oclc=39290180}}
*{{cite book |last=Andrews |first=Graeme |title=Fighting Ships of Australia & New Zealand |edition=1973–1974 |year=1973 |publisher=Regency House |location=Kogarah, NSW |isbn=0-909262-00-4 |oclc=868367}}
*{{cite book |last=Bastock |first=John |title=Australia's Ships of War |year=1975 |publisher=Angus and Robertson |location=Cremorne, NSW |isbn=0-207-12927-4 |oclc=2525523}}
*{{cite book |editor=Blackman, Raymond |title=Jane's Fleet Guide (1968–69) |edition=71st |year=1968 |publisher=Jane's Publishing Company |location=London |oclc=123786869}}
*{{cite book |last=Cassells |first=Vic |title=The Capital Ships: their battles and their badges |year=2000 |publisher=Simon & Schuster |location=East Roseville, NSW |isbn=0-7318-0941-6 |oclc=48761594}}
*{{cite book |last=Cecil |first=Michael K. |title=Mud & Dust: Australian Army Vehicles & Artillery in Vietnam |publisher=New Holland |location=Chatswood, NSW |year=2009 |isbn=978-1-74110-767-8 |oclc=460219619}}
*{{cite book |last=Dennis |first=Peter |author2=Grey, Jeffrey |author3=Morris, Ewan |author4= Prior, Robin |title=The Oxford Companion to Australian Military History |publisher=Oxford University Press |location=South Melbourne, VIC |year=2008 |edition=2nd |isbn=978-0-19-551784-2 |oclc=271822831}}
*{{cite book |last=Donohue |first=Hector |title=From Empire Defence to the Long Haul: post-war defence policy and its impact on naval force structure planning 1945–1955 |series=Papers in Australian Maritime Affairs (No. 1) |date=October 1996 |publisher=Sea Power Centre |location=Canberra |isbn=0-642-25907-0 |oclc=36817771 |issn=1327-5658}}
*{{cite book |last=Fairfax |first=Denis |title=Navy in Vietnam: a record of the Royal Australian Navy in the Vietnam War 1965–1972 |publisher=Australian Government Publishing Service |location=Canberra |year=1980 |isbn=0-642-02821-4 |oclc=9854447}}
*{{cite book |last=Frame |first=Tom |author-link=Tom Frame (bishop) |title=No Pleasure Cruise: the story of the Royal Australian Navy |year=2004 |publisher=Allen & Unwin |location=Crows Nest, NSW |isbn=1-74114-233-4 |oclc=55980812}}
*{{cite book |last=Frame |first=Tom |title=Pacific Partners: a history of Australian-American naval relations |year=1992 |publisher=Hodder & Stoughton |location=Rydalmere, NSW |isbn=0-340-56685-X |oclc=27433673}}
*{{cite book |last=Frame |first=Tom |title=Where fate calls: the HMAS Voyager tragedy |year=1992 |publisher=Hodder & Stoughton |location=Rydalmere, NSW |isbn=0-340-54968-8 |oclc=26806228}}
*{{cite book |last=Frame |first=Tom |author2=Baker, Kevin |title=Mutiny! Naval Insurrections in Australia and New Zealand |publisher=Allen & Unwin |location=St. Leonards, NSW |year=2000 |isbn=1-86508-351-8 |oclc=46882022}}
*{{cite book |last=Gillett |first=Ross |title=Australian and New Zealand Warships since 1946 |year=1988 |publisher=Child & Associates |location=Brookvale, NSW |isbn=0-86777-219-0 |oclc=23470364}}
*{{cite book |last=Gillett |first=Ross |others=MacDougall, Anthony; Graham, Colin (illustrations) |title=Warships of Australia |year=1977 |publisher=Rigby |location=Adelaide, SA |isbn=0-7270-0472-7 |oclc=4466019}}
*{{cite book |last=Grey |first=Jeffrey |author-link=Jeffrey Grey |title=Up Top: the Royal Australian Navy and Southeast Asian conflicts, 1955–1972 |year=1998 |series=The Official History of Australia's Involvement in Southeast Asian Conflicts 1948–1975 |publisher=Allen & Unwin |location=St. Leonards, NSW |isbn=1-86448-290-7 |oclc=39074315}}
*{{cite book |last=Hall |first=Timothy |title=HMAS Melbourne |year=1982 |publisher=George Allen & Unwin |location=North Sydney, NSW |isbn=0-86861-284-7 |oclc=9753221}}
*{{cite book |last=Ham |first=Paul |author-link=Paul Ham|title=Vietnam: the Australian war |publisher=HarperCollins |location=Pymble, NSW |year=2007 |isbn=978-0-7322-8237-0 |oclc=225613062}}
*{{cite book |last=Hobbs |first=David |editor=Stevens, David |editor2= Reeve, John |title=The Navy and the Nation: the influence of the Navy on modern Australia |year=2005 |publisher=Allen & Unwin |location=Crows Nest, NSW |isbn=1-74114-200-8 |oclc=67872922 |chapter=HMAS Sydney (III): a symbol of Australia's growing maritime capability}}
*{{cite book |last=Lind |first=Lew |title=The Royal Australian Navy: Historic Naval Events Year by Year |orig-year=1982 |edition=2nd |year=1986 |publisher=Reed Books |location=Frenchs Forest, NSW |isbn=0-7301-0071-5 |oclc=16922225}}
*{{cite book |last=MacDougall |first=Anthony K. |title=Australians at War: a pictorial history |orig-year=1991 |edition=2nd |year=2002 |publisher=The Five Mile Press |location=Noble Park, VIC |isbn=1-86503-865-2 |oclc=51053454}}
*{{cite book |last=McCaffrie |first=Jack |editor=Stevens, David |editor2= Reeve, John |title=Sea Power ashore and in the air |year=2007 |publisher=Halstead Press |location=Ultimo, NSW |isbn=978-1-920831-45-5 |oclc=271328006 |chapter=Korea: The first challenge for Australian naval aviation}}
*{{cite book |last=Nott |first=Rodney |author2=Payne, Noel |title=The Vung Tau Ferry: HMAS Sydney and Escort Ships |publisher=Rosenberg |location=Dural, NSW |orig-year=1994 |year=2008 |edition=4th |isbn=978-1-877058-72-1 |oclc=254773862}}
*{{cite book |last=Pfennigwerth |first=Ian |title=Tiger Territory: The untold story of the Royal Australian Navy in Southeast Asia from 1948 to 1971 |publisher=Rosenberg |location=Kenthurst, NSW |year=2008 |isbn=978-1-877058-65-3 |oclc=191754413 |url=https://books.google.com/books?id=sHIy3iDVz6UC}}
*{{cite book |editor=Stevens, David |title=The Royal Australian Navy |series=The Australian Centenary History of Defence (vol III) |year=2001 |publisher=Oxford University Press |location=South Melbourne, VIC |isbn=0-19-555542-2 |oclc=50418095}}
**{{cite book |last=Cooper |first=Alastair |title=The Royal Australian Navy |chapter=The Korean War Era" and "The Era of Forward Defence}}
**{{cite book |last=Jones |first=Peter |title=The Royal Australian Navy |chapter=Towards Self Reliance}}
*{{cite book |last=Wright |first=Anthony |title=Australian Carrier Decisions: the acquisition of HMA Ships Albatross, Sydney and Melbourne |orig-year=1978 |series=Papers in Australian Maritime Affairs (No. 4) |date=June 1998 |publisher=Sea Power Centre |location=Canberra |isbn=0-642-29503-4 |issn=1327-5658 |oclc=39641731}}

===Journal and news articles===
*{{cite journal |last=Hobbs |first=David |date=Winter 2004 |title=British Commonwealth Carrier Operations in the Korean War |journal=Air & Space Power Journal |volume=18 |issue=4 |pages=62–71 |issn=1555-385X}}
*{{cite journal |last=Hobbs |first=David |date=October 2007 |title=HMAS ''Melbourne'' (II) – 25 Years On |journal=The Navy |volume=69 |issue=4 |pages=5–9 |issn=1322-6231}}
*{{cite news |url=http://www.navy.gov.au/Navy_Marks_109th_Birthday_With_Historic_Changes_To_Battle_Honours |title=Navy Marks 109th Birthday With Historic Changes To Battle Honours |date=1 March 2010 |archive-url=https://web.archive.org/web/20110613184920/http://www.navy.gov.au/Navy_Marks_109th_Birthday_With_Historic_Changes_To_Battle_Honours |archive-date=13 June 2011 |publisher=Royal Australian Navy |access-date=23 December 2012}}
**{{cite web |url=http://www.navy.gov.au/w/images/Units_entitlement_list.pdf |title=Royal Australian Navy Ship/Unit Battle Honours |date=1 March 2010 |publisher=Royal Australian Navy |archive-url=https://web.archive.org/web/20110614064156/http://www.navy.gov.au/w/images/Units_entitlement_list.pdf |archive-date=14 June 2011 |access-date=23 December 2012}}

===Websites and press releases===
*{{cite web |url=http://www.navy.gov.au/hmas-sydney-iii |title=HMAS Sydney (III) |access-date=4 March 2010 |publisher=Sea Power Centre – Royal Australian Navy |url-status=dead |archive-url=https://web.archive.org/web/20160121154219/http://www.navy.gov.au/hmas-sydney-iii |archive-date=21 January 2016 }}
*{{cite web |url=http://www.navy.gov.au/history/traditions/australian-white-ensign |title=Australian White Ensign |access-date=4 March 2010 |publisher=Sea Power Centre – Royal Australian Navy}}
*{{cite press release |title=Next generation of naval ships to reflect a rich history of service |publisher=Department of Defence |date=20 January 2006 |url=http://www.defence.gov.au/minister/Hilltpl.cfm?CurrentId=5368 |access-date=1 June 2009}}

== External links ==
{{Commons category|HMAS Sydney (R17)}}
* [https://web.archive.org/web/20090929173325/http://www.navy.gov.au/The_Vung_Tau_Ferry The Vung Tau Ferry] – A short video depicting ''Sydney''{{'}}s fifteenth troop transport voyage to Vietnam

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{{DEFAULTSORT:Sydney (R17)}}
[[Category:Majestic-class aircraft carriers of the Royal Australian Navy]]
[[Category:Ships built in Plymouth, Devon]]
[[Category:1944 ships]]
[[Category:World War II aircraft carriers of the United Kingdom]]<!-- was built and launched during WWII; the lack of commissioning and service is not relevant to this category -->
[[Category:Korean War aircraft carriers of Australia]]
[[Category:Training ships of the Royal Australian Navy]]
[[Category:Troop ships of the Royal Australian Navy]]
[[Category:Vietnam War naval ships of Australia]]
[[Category:Cold War aircraft carriers of Australia]]