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{{Short description|Military transport aircraft series by Chase Aircraft, later Fairchild Aircraft}}
{{Infobox aircraft
 |name= C-123 Provider
 |image= File:AC Fairchild C123 colour.jpg
 |caption= A [[United States Coast Guard]] HC-123B Provider from [[Coast Guard Air Station Miami|CGAS Miami]].
 |type= [[Military transport aircraft]]
 |national_origin= United States
 |manufacturer = [[Chase Aircraft]]<br>[[Fairchild Aircraft]]
 |designer= <!-- Only appropriate for one-person designers, not project leaders or chief designers -->
 |first_flight= 14 October 1949
 |introduction= 1956
 |retired= 1995 ([[Royal Thai Air Force]])<ref>{{cite web|url=http://www.thai-aviation.net/files/Air_Force_Summary.pdf |title=Royal Thai Air Force |publisher=Thai Aviation |date=2 September 2016 |access-date=17 November 2016 |url-status=dead |archive-url=https://web.archive.org/web/20161104191035/http://www.thai-aviation.net/files/Air_Force_Summary.pdf |archive-date=4 November 2016 |df=dmy-all }}</ref>
 |status= 
 |primary_user= United States Air Force (historical)
 |more_users= [[United States Coast Guard]] (historical)<br>[[South Vietnam Air Force]] (historical)
 |produced= 1949–1970
 |number_built= 307
 |developed_from = [[Chase XCG-20]]
 |variants = [[Chase XC-123A]]<br>[[Stroukoff YC-134]]
 |developed_into =
}}

The '''Fairchild C-123 Provider''' is an American [[military transport aircraft]] designed by [[Chase Aircraft]] and built by [[Fairchild Aircraft]] for the [[U.S. Air Force]]. In addition to its USAF service, which included later service with the [[Air Force Reserve]] and the [[Air National Guard]], it went on to serve the [[U.S. Coast Guard]] and various air forces in [[Southeast Asia]]. During the [[Vietnam War|War in Vietnam]], the C-123 was used to deliver supplies, to evacuate the wounded, for agent insertions behind enemy lines, and was also used to spray [[Agent Orange]].

==Design and development==
[[File:Chase XG-20 glider USAF.jpg|thumb|right|A Chase XG-20 glider, which was later converted to the XC-123A prototype.]]
[[File:Chase XC-123 Provider prototype c1949.jpg|thumb|right|The XC-123 prototype.]]

The C-123 Provider was designed originally as an assault [[military glider|glider]] aircraft for the [[United States Air Force]] (USAF) by [[Chase Aircraft]] as the [[Chase XCG-20|XCG-20]] (Chase designation MS-8 Avitruc)<ref name="Gunston p. 170">Gunston 1980a, p. 170.</ref> Two powered variants of the XCG-20 were developed during the early 1950s, as the XC-123 and [[Chase XC-123A|XC-123A]]. The only difference was the class of engines used. The XC-123 used two [[Pratt & Whitney R-2800]]-23 air-cooled radial piston engines, while the XC-123A was fitted with four [[General Electric J47]]-GE-11 turbojets, in two pods.<ref name="Andrade87">Andrade 1979, p. 87.</ref> The XC-123A also has the distinction, while being experimental, of being the first USAF's jet-powered military transport.<ref>Rolfe, Douglas and Alexis Dawydoff. ''Airplanes Of The World''. New York: Simon & Schuster, 1962.</ref> While the piston-powered XC-123 was initially well-regarded for its ruggedness, reliability, and its ability to operate from short and unimproved airstrips, the turbojet-powered XC-123A – designed for high-speed transport between USAF bases for critical parts and personnel – was found unable to operate from short and rough airstrips. There was also no practical speed advantage due to the wing and fuselage design, and a drastic reduction in range. Only the one turbojet-powered test and evaluation version was built.{{Citation needed|date=August 2010}}

While the United States Air Force was interested in placing an order for the new transport, Chase did not have the production capacity to meet the Air Force's needs, and sought a partner to handle production of the new aircraft.<ref name="am222p116-7">Beck 2022, pp. 116–117</ref> By 1953, [[Henry J. Kaiser]] purchased a majority share in Chase Aircraft, feeling that after having completed [[Fairchild C-119 Flying Boxcar|C-119]]s for Fairchild under contract, he could take control of the impending C-123 contract. Two airframes were completed at Kaiser's [[Willow Run]] factory in [[Ypsilanti, Michigan]], before a pricing scandal that led to Kaiser's being told that no further contracts with him would be honored. The C-123 contract was put up for bid, and the two completed airframes scrapped. The contract was finally awarded to [[Fairchild Aircraft|Fairchild Engine and Airplane]], who assumed production of the former Chase C-123B, a refined version of the XC-123.<ref>Gunston 1977, p. 164.</ref> Before turning production over to Fairchild, Chase originally named their C-123B the ''AVITRUC'' but it never stuck.<ref>{{cite magazine |url=http://www.flightglobal.com/pdfarchive/view/1954/1954%20-%203019.html |title=Military transports: Fairchild C-123 Provider  |magazine=[[Flight International|Flight]] |date=5 November 1954 |page= 682 |archive-url=https://web.archive.org/web/20160305165119/https://www.flightglobal.com/pdfarchive/view/1954/1954%20-%203019.html |archive-date=5 March 2016}}</ref>

==Operational history==
{{more citations needed section|date=March 2019}}
The first recipients of C-123 aircraft were USAF transport units, soon followed by the [[U.S. Coast Guard]] (USCG) which used the aircraft for [[search and rescue]] (SAR) missions, and even the [[U.S. Air Force Thunderbirds|U.S. Air Force Demonstration Team, the "Thunderbirds]]," used C-123s for a time as a logistics support aircraft for transporting the team's ground crews and equipment. The type would also be widely exported under various U.S. military assistance programs, directly from USAF stocks. A C-123 was used to transport President John F. Kennedy's [[SS-100-X|limousine]] during his November, 1963, Texas tour.

[[File:C-123B in flight over US 1950s.jpg|thumb|USAF C-123Bs in the 1950s.]]

The C-123 was nearly ignored by the USAF for service in Vietnam, but a political rivalry with the [[U.S. Army]] and the Army's use of the [[de Havilland Canada DHC-4 Caribou|CV-2 Caribou]] and later pre-production order for the [[de Havilland Canada DHC-5 Buffalo|de Havilland Canada C-8 Buffalo]], led to a decision to deploy C-123s there. To compete with the well-performing CV-2, the USAF and Fairchild furthered development on the C-123 to allow it to do similar work on short runways. This additional development increased the utility of the aircraft and its variants to allow it to perform a number of unique tasks, including the '''HC-123B''' which operated with the USCG fitted with additional radar equipment for search and rescue missions through 1971, and the '''C-123J''' which was fitted with retractable skis for operations in [[Greenland]] and [[Alaska]] on compacted snow runways.

[[File:UC-123B Ranch Hand spraying 1962.jpg|thumb|A [[Operation Ranch Hand|Ranch Hand]] UC-123B over Vietnam in 1962.]]
[[File:C-123K 19 ACS over Mekong Delta 1969.jpg|thumb|A [[19th Special Operations Squadron|19th ACS]] C-123K over the [[Mekong Delta]], 1969.]]

By 1962, the '''C-123K''' variant aircraft was evaluated for operations in Southeast Asia and their stellar performance led the Air Force to upgrade 180 of the C-123B aircraft to the new C-123K standard, which featured auxiliary jet pods underneath the wings, and anti-skid brakes. In 1968, the aircraft helped resupply troops in [[Khe Sanh]], [[Vietnam]], during a three-month siege by [[North Vietnam]].<ref name="Gunston p. 170"/>

A number of C-123s were configured as VIP transports, including General [[William Westmoreland]]'s ''White Whale''. The C-123 also gained notoriety for its use in "[[Operation Ranch Hand]]" defoliation operations in Vietnam. Oddly enough, the USAF had officially chosen not to procure the '''VC-123C''' VIP transport, opting instead for the [[C-131 Samaritan|Convair VC-131D]].

The first C-123s to reach South Vietnam were part of the USAF's Special Aerial Spray Flight, as part of Operation '''Ranch Hand''' tasked with defoliating the jungle in order to deny rebels their traditional hiding places.<ref name="Gunston p. 171">Gunston 1980a, p. 171.</ref> These aircraft began their operations at the end of 1961. Aircraft fitted with spraying equipment were given the U prefix as a role modifier, with the most common types being the '''UC-123B''' and the '''UC-123K'''. Aircraft configured for this use were the last to see military service, in the control of outbreaks of insect-borne disease. The C-123 was also used as "jump aircraft" for U.S. Army Airborne students located at [[Lawson Army Airfield]], [[Fort Benning, Georgia]] from the early 1970s through the early 1980s. This aircraft was used in conjunction with the [[Lockheed C-130 Hercules]] and [[Lockheed C-141 Starlifter]].

In 1958, the [[U.S. Coast Guard]] received its first HC-123B from the [[USAF]], followed by seven more<ref name=":0">{{Cite web |title=Fairchild C-123B "Provider" (1958) |url=https://cgaviationhistory.org/aircraft_/fairchild-c-123b-provider/ |access-date=2024-04-26 |website=Coast Guard Aviation History |language=en-US}}</ref> in 1961. Prior to the [[Vietnam War]] the C-123B was utilized for a multitude of missions such as a troop carrier, medivac transport, and support missions from short, minimally-prepared landing strips.<ref>{{Cite web |title=1958: C-123B Aircraft Obtained |url=https://cgaviationhistory.org/1958-c-123b-aircraft-obtained/ |access-date=2024-04-26 |website=Coast Guard Aviation History |language=en-US}}</ref> Installation of a dome on the nose of the aircraft accommodated a large radar allowing the plane to meet the requirements for search and rescue and long range flight over water. The Coast Guard crewed the aircraft with a complement of five: two officers serving as the pilot and copilot, augmented by an enlisted flight mechanic, an enlisted navigator, and an enlisted loadmaster. The HC-123B's role in the Coast Guard was slowly replaced by the longer-ranged Coast Guard [[HC-130]] aircraft during the 1960s and 1970s as those newer airframes came on line.<ref>{{cite web |url=http://voices.yahoo.com/history-c-123-its-coast-guard-571698.html |title=History of the C-123 and Its Use by the Coast Guard - Yahoo Voices - voices.yahoo.com |access-date=2014-02-13 |url-status=dead |archive-url=https://web.archive.org/web/20140729012854/http://voices.yahoo.com/history-c-123-its-coast-guard-571698.html |archive-date=2014-07-29 }}</ref>{{unreliable source?|date=October 2015}} In 1972 the final C-123B in the U.S Coast Guards' Inventory was retired.<ref name=":0" /><ref>{{Cite web |title=Fairchild C-123B "Provider" |url=https://www.history.uscg.mil/browse-by-topic/Aviation/Article/3051607/fairchild-c-123b-provider/ |access-date=2024-04-26 |website=United States Coast Guard |language=en-US}}</ref>

With the end of the [[Vietnam War]], remaining C-123Ks and UC-123Ks were transferred to tactical airlift units of the [[Air Force Reserve]] (AFRES) and the [[Air National Guard]] (ANG) that were operationally-gained by [[Tactical Air Command]] (TAC) before 1975 and [[Military Airlift Command]] (MAC) after 1975.<ref>{{cite web|url=http://www.nationalmuseum.af.mil/factsheets/factsheet.asp?id=310|archive-date=4 February 2014|archive-url=https://web.archive.org/web/20140204001303/http://www.nationalmuseum.af.mil/factsheets/factsheet.asp?id=310 |title=Fairchild C-123 Provider|publisher=National Museum of the United States Air Force|access-date=14 July 2017}}</ref>

The [[302d Airlift Wing|302nd Tactical Airlift Wing]] at [[Rickenbacker AFB]] (later [[Rickenbacker ANGB]]), Ohio, flew the last UC-123Ks Providers in operational service before being converted to the [[Lockheed C-130 Hercules]]. Known as the Special Spray Flight, these aircraft were used to control insect-borne diseases, with missions to Alaska, South America, and Guam being among the humanitarian missions performed by this Air Force Reserve unit.<ref>{{cite web|url=http://www.theaviationzone.com/factsheets/c123.asp|title=C-123|website=theaviationzone.com|access-date= 10 August 2010}}</ref>

The final examples of the C-123 in active U.S. military service were retired from the [[Air Force Reserve]] and [[Air National Guard]] in the early 1980s. Some airframes were transferred to the [[Federal Aviation Administration]] (FAA) for test and evaluation programs while others were transferred to the [[U.S. Department of Agriculture]] (USDA) for miscellaneous programs. These aircraft were also retired by the end of the 1990s.

===Experimental projects===
[[File:YC-123E with pantobase landing gear 1955.jpg|right|thumb|YC-123E with pantobase landing gear]]

In 1954, the '''YC-123D''', formerly the XC-123A prototype, flew in its modified state after being converted by '''Stroukoff Aircraft'''. While the most obvious change from the original XC-123A was the switch of engines (to two {{convert|3500|hp|abbr=on}} Wright Turbo Compound [[Wright R-3350|R3350]]-89A [[radial engine]]s, turning four-blade, thirteen foot Aeroproducts constant-speed [[Propeller (aircraft)#Feathering|fully feathering]] [[propeller (aircraft)|propeller]]s), the YC-123D also had a [[boundary layer control]] system fitted. This system directs air from the engines at high speed over the top of the wing, making the wing act as if the aircraft is flying at a higher airspeed. As a result, the YC-123D had a greatly reduced takeoff and landing distance. Compared to the C-123B, the YC-123D could land in 755&nbsp;feet instead of 1,200, and takeoff with only 850&nbsp;ft of runway instead of 1,950, with a 50,000&nbsp;lb total weight.

In 1955, Stroukoff, under contract from the USAF, produced a single [[Stroukoff YC-134|YC-123E]], designed to be able to take off from any surface, and also equipped with BLC. The new aircraft also featured Stroukoff's ''Pantobase'' system, combining a ski system with a sealed fuselage and wing mounted floats, while retaining its normal landing gear. The skis worked both on snow and water, and the system effectively allowed the aircraft to land on water, land, snow or ice.

In 1956, the USAF awarded a contract to Fairchild to design an improved version of the C-123 under the designation '''C-136''', but the contract was cancelled before the aircraft was built.<ref>{{cite web|author=Parsch, Andreas|url=http://www.designation-systems.net/usmilav/missing-mds.html|title="Missing" USAF/DOD Aircraft Designations|website=designation-systems.net|year=2009|access-date=29 October 2010}}</ref>

At much the same time, the '''YC-123H''' was under development, the product of a Fairchild modification program started in 1956 and completed in 1957.{{Citation needed|date=September 2011}} A "Jet Augmentation Program" for existing C-123Bs had been initiated in 1955 at the behest of the USAF, and in the YC-123H contract the USAF expanded it to allow the mounting of two pod-mounted [[General Electric J85]] turbojets.

In 1979, the Royal Thai government, seeking to extend the life of their C-123 fleet, placed a contract with the Mancro Aircraft Company, supported by the USAF, to convert a single C-123B to [[turboprop]] powerplants.{{Citation needed|date=September 2011}} [[Allison T56]]-A-7 turboprops were used and by the time the aircraft, dubbed '''C-123T''', was complete it had new [[fuel tank|"wet"]] wings, an [[auxiliary power unit]] (APU) to assist with power movement of the control surfaces, and a heating system for the cargo compartments that also fed a new de-icing system.{{Citation needed|date=September 2011}} Budgetary restrictions forced the Thai government to abandon the program in 1981, and with a lack of interested parties development of the C-123T stopped.{{Citation needed|date=September 2011}} However, it concluded the life of the C-123 by making it the only aircraft type to operate under jet, piston, and turboprop engine power, and as a glider, during its history.{{Citation needed|date=September 2011}}{{#tag:ref|The DC-3/C-47 family has operated as a glider and under turboprop power, but not under jet power.|group=N}}

The C-123T has recently been revived by a joint venture between the US-based Fleetwings Aircraft Company and the South African company Elmer Group. In 2010, they announced a project to initially remanufacture old airframes for African customers and, where there was demand, to build new aircraft. The airframes would be fitted with new turboprop [[Allison T56|Rolls-Royce T56]]-A-15 engines, a glass cockpit and other enhancements. The proposed C-123T would have had a 25,000&nbsp;lb payload capability, and a take-off run of just over 1,000&nbsp;ft at 50,000&nbsp;lb MTOW. Possible applications included maritime patrol, search and rescue, and even use as a gunship, while roll-on packages have already been developed for mid-air refueling and agricultural applications.<ref>"Sturdy Provider for Africa." ''Jane's IHS, 2010'' via ''[[Africa Aerospace and Defence]] Exhibition News,'' 21 September 2010.</ref>

===Black Spot and other special military C-123s===
During the Vietnam War, some C-123s were modified for specialized roles. Most of these modifications were on a one- or two-aircraft level. Only the usage of C-123s as "flare ships" to illuminate targets for fixed wing [[gunship]]s such as the [[Douglas AC-47 Spooky|AC-47]] and [[Fairchild AC-119|AC-119G]] were more numerous. These aircraft operating under the call-sign ''Candle'' were flown by the USAF's [[14th Flying Training Wing|14th Special Operations Wing]].

[[File:NC-123K.jpg|thumb|US Air Force NC-123K "permanent test" model used over the [[Ho Chi Minh Trail]]. It was outfitted with a forward looking infrared system, [[low light level television]], a laser rangefinder, and cluster bomb dispensers.]]

A single C-123B was tested as a possible replacement for the ''Candle'' aircraft, with its rear loading ramp removed and replaced with a large box with 28 large lights. The aircraft could continuously light a {{convert|2|mi|km|adj=on}} circle from an altitude of {{cvt|12,000|ft|m}}. This aircraft, under the provisional designation '''NC-123B''', was dropped because the lights fixed to the aircraft made it far easier for enemy gunners to track compared to the earlier flare ships.

The "Candle" aircraft had an extended life when several UC-123Ks were transferred to [[Nakhon Phanom Royal Thai Air Force Base]] in [[Thailand]]. During that period, it was used as a flare ship as well as a [[forward air control]] (FAC) aircraft. The flare duties were generally used for troops in contact (TIC) while the FAC mission directed [[air strike]]s in [[Laos]] over the Ho Chi Minh trail.

Another NC-123B was used as a radio relay aircraft over the Ho Chi Minh trail, with equipment to read the signals from various sensors on the ground designed to pick up enemy truck activity.

{{anchor|BlackSpot}}Two C-123K aircraft modified in September 1965 under Project '''Black Spot'''.<ref name="Smith, undated. p. VI">Smith undated,  p. VI.</ref> The Black Spot aircraft were to fit under the "self-contained night attack capability" that was Operation Shed Light's primary focus and [[E-Systems]] of [[Greenville, Texas]], was contracted to complete the modifications. These aircraft featured a variety of new sensors including [[Low light level television|Low Light Level TV]] (LLLTV), Forward Looking Infrared (FLIR), and a laser rangefinder.<ref>Smith undated,  p. 6.</ref> The aircraft looked radically different visibly from its transport brethren, as the new equipment required lengthening the nose by over {{convert|50|in|cm|0}}.<ref name="Davis p. 50">Davis 1982, p. 50.</ref> The aircraft also featured an armament system designed to carry BLU-3/B (using the ADU-253/B adapter) or BLU-26/B (using the ADU-272/B adapter) [[Cluster bomb|bomblets]], or CBU-68/B [[cluster bomb]]s.<ref>Smith undated,  pp. 7, 32.</ref><ref>{{cite web|author=Parsch, Andreas |url=http://www.designation-systems.net/usmilav/asetds/u-a.html#_ADU|title=AAU/AAK to AVU/AVK – Equipment Listing|website=designation-systems.net|date=31 August 2007|access-date=29 October 2010}}</ref>

The two aircraft, AF Serial Numbers 54-0691 and 54-0698, were first designated NC-123K in 1968 and then redesignated '''AC-123K''' in 1969.{{#tag:ref|From Individual Aircraft Records Cards Set, provided as part of information received 24 May 2007 pursuant to Freedom of Information Act request 49112, from the Air Force Historical Research Agency, United States Air Force, Maxwell AFB, AL|group=N}} These NC/AC-123Ks were first deployed operationally at [[Osan Air Base|Osan AB]], [[South Korea]], between August and October 1968, and flying in support of operations against [[North Korea]]n infiltrators approaching by boat. The operations in Korea met with a certain level of success and as a result the NC/AC-123Ks were transferred to South Vietnam in November 1968. The aircraft operated there until January 1969, when they were redeployed to [[Ubon Royal Thai Air Force Base|Ubon RTAB]], [[Thailand]]. The two aircraft were then returned to the United States to [[Hurlburt Field]], [[Florida]], in May 1969, where a second round of training occurred. Four crews attended a ground school in Greenville, Texas, and returned to Hurlburt where they flew the aircraft for the first time.

The fate of the aircraft is still unclear. Sources have missions terminating in early July 1970 and the aircraft flying to the [[309th Aerospace Maintenance and Regeneration Group|Military Aircraft Storage and Disposition Center (MASDC)]] "boneyard" at [[Davis-Monthan Air Force Base|Davis-Monthan AFB]], Arizona, where they were returned to C-123K standard, then returned to South Vietnam still wearing their camouflage and black undersides for transport duty.<ref name="Davis p. 50"/> However, the official history states that combat operations ceased on 11 May 1969, with no mention of the second deployment.<ref name="Smith, undated. p. VI"/> While the second deployment is mentioned in associated documentation, the only dates are of the arrival in Thailand and there is no information as to when they departed or where their destination was.<ref>Boerschig 1969, p. 5.</ref>

{{Main|Operation Shed Light}}

===Covert operations===

====Southeast Asia====
In 1962, the CIA acquired five C-123Bs from USAF for Air America to be used in Laos and Vietnam, and another 5 C-123Bs to be used by [[Republic of China Air Force]] ([[Taiwan]]) top secret 34th Squadron, a Black Ops units called the "[[Black Bat Squadron|Black Bat]]", as Flight B section (Flight A section was the two P2V-7U/RB-69A). The five Taiwan C-123Bs were sent to Lockheed Skunk Works for modifications as covert insertion aircraft with "smart" air-to-air jammer, BSTR system to jam the radars of ground anti-aircraft guns, also added a defensive operator's station to operate the jammers on board, with extra fuel in underwing tanks, with 36 Taiwanese crew finished training courses at Pope AFB by November 1962.

The five ROCAF/Taiwan/CIA C-123Bs would be used over North Vietnam as low level and nighttime covert airdrop aircraft, under the South Star II agreement, under the guise of Taiwan's national airline, China Airlines, which had "cover story" of operating Vietnamese Air Transport (VIAT) in South Vietnam, that was formerly operated by Air America. The secret outfit was based in Saigon, but would fly out of Da Nang for airdrop missions going into North Vietnam, with some missions lasting 14 hours.
[[File:Cambodian trophies from Vietnam War 1964.jpg|alt=A damaged plane and a military vehicle on display on plinths in the open air|thumb|US military equipment captured by Cambodian forces, including a C-123 shot down on 24 October 1964<ref>{{Cite web |title=ASN Aircraft accident Fairchild C-123B-14-FA Provider 55-4549 Phumi Dak Dam |url=https://aviation-safety.net/database/record.php?id=19641024-0 |access-date=2024-02-01 |website=aviation-safety.net}}</ref>]]
On 1 February 1964, the overall control of South Star II was transferred from CIA to Studies and Observations Group (SOG), as part of U.S. Military Assistance Command Vietnam (MACV) in Saigon. The outfit was redesignated as Det. 1 of USAF's 75th Troop Carrier Squadron (TCS), but within SOG it was known as the First Flight Detachment (FFD).

In May 1964, under "Project Duck Hook", six more C-123s received extensive modifications by Lockheed Air Service at Ontario, California, equipped with ATIR and BSTR ECM packages, ASN-25 Doppler navigation system, APN-153 terrain-following radar, a console station for radio operator, new HF radio and other radios. These aircraft were issued to the secret Taiwanese Black Bat unit operating in South Vietnam. In October 1964, MACV, CIA and ROCAF/Taiwan signed the South Star III agreement to continue the operation in Vietnam. The six "Duck Hook" C-123Bs were based at [[Nha Trang Air Base]], north of Cam Ranh Bay, officially designated as USAF Det. 12 of 1131 Special Activities Squadron.

The "Duck Hook" C-123Bs were updated with RDR-10 weather radar and ARN-131 homing receiver in 1966 in order to perform missions over the Ho Chi Minh trail. All C-123Bs were converted to C-123Ks in 1968, with two wing-mounted turbojets, plus an ECM upgrade with APR-25 radar warning receiver and ALE-1 chaff dispenser. Project "Duck Hook" designation was ultimately changed to "Heavy Hook". The Det. 12 of 1131 Special Activities Squadron unit at Nha Trang received an outstanding unit award from the USAF, for flying 4,000 classified combat and combat support missions from June 1966 to May 1968.

In May 1970, C-123Ks from the "Black Bats" supported the secret U.S. military incursion into Cambodia. In October 1970, flights into Laos began. In March 1972, the SOG was deactivated, and the Southern Star operation ended with four surviving C-123Ks returned to Taiwan. On 1 March 1973, 34th "Black Bat" Squadron of ROCAF/Taiwan was disbanded.<ref name="Pocock">Pocock, Chris. ''The Black Bats: CIA Spy Flights Over China From Taiwan, 1951–1969''. Atglen, Pennsylvania: Schiffer Publishing, 2010. {{ISBN|978-0-7643-3513-6}}.</ref>

====Central America====
{{main|Corporate Air Services HPF821}}
On 5 October 1986, a Corporate Air Services C-123 Provider (HPF821, previously N4410F and USAF 54-679, (c/n 20128))<ref>Omang, Joanne and George C. Wilson. "Questions About Plane's Origins Grow." ''Washington Post,'' 9 October 1986, pp. A-1, A-32.</ref> departed San Salvador-[[Ilopango]] Airport in [[El Salvador]] loaded with 70 [[AK-47]] rifles and 100,000 rounds of ammunition, rocket grenades and other supplies. It flew along the coastline of [[Nicaragua]] and entered Nicaraguan airspace near the border with [[Costa Rica]]. Nearing San Carlos, the plane descended to 2,500 feet while preparing to drop off its cargo to [[Contras|Contra]] fighters.

While conducting the drop, the C-123 was shot down by a Sandinista soldier, using a [[SA-7 Grail]]. [[CIA]] pilots Wallace "Buzz" Sawyer and William Cooper were killed in the crash. Loadmaster [[Eugene Hasenfus]] parachuted to safety and was taken prisoner. He was later released in December 1986.<ref>{{cite web|author=Lednicer, David|url=http://myplace.frontier.com/~anneled/ColdWar.html|title=Intrusions, Overflights, Shootdowns and Defections During the Cold War and Thereafter|access-date= 24 September 2011}}</ref> The Fairchild C-123 that was shot down in Nicaragua remains there. Its sister ship, also a Fairchild C-123 that was purchased by the CIA at the same time as the first one, was then left abandoned at San Jose International Airport for a time and then was purchased for $3,000 and disassembled into 7 pieces and transported via boat to Quepos, Costa Rica and then reassembled and is now the center piece of a beachside cocktail lounge just up the road from Manual Antonio national park.<ref>{{cite web|url=https://www.elavion.net/ |title=El Avion Bar and Restaurant|access-date= 19 September 2022}}</ref>

====Agent Orange controversy====
In 2011, a retired Air Force officer, Major Wesley T. Carter, filed a complaint with the Air Force Inspector General alleging that the Air Force knew that UC-123Ks used for spraying Agent Orange in Vietnam remained contaminated and that the Air Force had failed to properly inform subsequent flight crews of the risks following their transfer to the [[Air Force Reserve]] at the end of the Vietnam War. In his complaint, Major Carter contends that the Air Force has known since 1994 that the aircraft were contaminated with the defoliant; he cites the fact that when a former C-123 was being prepared for a permanent static display that workers had to use HAZMAT suits and respirators. Additionally, it is asserted that when the aircraft was tested by the Air Force, it contained high levels of the known [[carcinogen]] [[polychlorinated dibenzodioxin]], studies since confirmed by the Oregon Health Sciences University and Columbia University's Mailman School of Public Health.{{citation needed|date=January 2013}}

The aircraft which were flown from 1972–1982, were assigned to the Air Force Reserve after their service in Vietnam, and used for normal cargo and aeromedical evacuation missions. Air crews accumulated hundreds of flight hours aboard several contaminated aircraft that were often flown with the windows open due to the smell and eye irritation. Memos surfaced showing that Air Force JAG officers recommended keeping the toxicity information, "...within official channels." Further, Major Carter located Air Force reports of dioxin-contaminated aircraft sold abroad, and of one used at the [[Robins AFB]], Georgia [[Museum of Aviation (Warner Robins)|Museum of Aviation]] with public access to the contaminated surfaces of the aircraft. In 2010, due to concerns about dioxin contamination, the Air Force took the unusual step of shredding all the remaining surplus C-123K/UC-123K aircraft and melting the scraps into ingots for disposal.<ref>{{cite web|author=Philpott, Tom|url=http://www.gazette.com/articles/force-118937-air-aircraft.html|title=Military Update: Complaint alleges Agent Orange risks ignored|archive-url=https://web.archive.org/web/20120102004718/http://www.gazette.com/articles/force-118937-air-aircraft.html |archive-date=2012-01-02|website=The Gazette|access-date=31 May 2011}}</ref>

On 9 June 2011, the Secretary of the U.S. Air Force's Inspector General rejected Carter's complaints, and in a subsequent message explained, "Unfortunately, we do not have the ability to identify or notify the individuals in the categories you mention" when asked if the military would alert the aircrews regarding their exposure to dioxin. On 18 June 2011, the veterans' complaint was accepted with the Department of Defense Inspector General, adding the request that the UC-123K aircraft themselves be designated by the Secretary of Defense as "Agent Orange Exposure Sites".<ref>"DOD IG Complaint #02301." ''Secretary of Defense, Department of Defense.''</ref>

In December 2011, the U.S. Department of Veterans Affairs posted two notices of its decision that, while the post-Vietnam aircraft "may" have been contaminated, the aircrews were "unlikely" to have suffered exposure to dioxin. In an unusual response, the U.S. Center for Toxic Substance and Disease Registry quickly countered the VA position on 25 January 2012 with a statement by their Deputy Director concluding that aircrews and maintenance personnel most likely were exposed well beyond military and government surface-wipe screening levels.<ref>{{cite web|url=https://docs.google.com/file/d/0B88rlJ4p_859MjhjZGRhZmUtY2JjOS00NzJlLTk2OGItYmNmZmVlOWU2ZmRh/edit?hl=en_US&pli=1 |author=Sinks, Dr. T. (Deputy Director)|title=Official letter|publisher=Agency for Toxic Substances & Disease Registry|date=26 January 2012}}</ref>

==Variants==
[[File:C123KProviderCockpitCAM.jpg|thumb|right|Cockpit of a C-123K Provider at the [[Castle Air Museum]]]]
[[File:Fairchild C-123J Provider 3-view line drawing.png|thumb|A 3-view line drawing of a Fairchild C-123J Provider]]

;[[Chase XCG-20]]
:Two prototype all-metal troop transport gliders built by [[Chase Aircraft]], later designated the XG-20, one became the XC-123, the other the XC-123A.
;Chase XC-123
:Former XG-20 fitted with two {{cvt|2,200|hp|kW}} R-2800-23 engines.
;[[Chase XC-123A]]
:Former XG-20 fitted with four J47-GE-11 turbojets in pairs (of the type used by the [[Convair B-36|B-36]] and [[Boeing B-47 Stratojet|B-47]]<ref>Gunston 1980b {{Page needed|date=December 2011}}</ref>) under wings.<ref name="Andrade87" /><ref>{{cite periodical|url=https://books.google.com/books?id=0SADAAAAMBAJ&dq=popular+science+1951+how+your+train+stops&pg=PA81|title=Jet Power Troop Transport|magazine=Popular Science|date=July 1951|page=photo bottom of p. 81}}</ref>
;C-123B
:Production model based on the XC-123 with two {{cvt|2,300|hp|kW}} R-2800-99W engines with accommodation for 61 troops or 50 stretchers, five built by Chase and 302 build by Fairchild Aircraft.
;UC-123B
:C-123Bs modified for defoliation and crop destruction duties.
;VC-123C
:Executive transport version of the jet-powered XC-123A, not built.
;Stroukoff YC-123D
:One aircraft built by Stroukoff with boundary layer control system for improved STOL performance.
;Stroukoff YC-123E
:One aircraft built by Stroukoff with modified fin and rudder, modified fuselage bottom (called ''Pantobase'') and pontoon floats to allow operation from water, sand, snow or ice.
;YC-123H
:Prototype with wide track undercarriage and two underwing J85 booster engines.
;C-123J
:C-123B with two wing tip mounted [[Fairchild J44|Fairchild J44-R-3]] booster engines, 10 converted on the production line, plus one converted later for the CAA (later FAA) for Alaska operations.<ref name="am222p116-7" />
;C-123K
:C-123Bs with two underwing J85 booster engines and larger wheels, 183 converted.
;AC-123K/NC-123K
:Two C-123Bs converted for armed nighttime surveillance with special sensors.
;C-123L
:Proposed [[STOL]] variant with [[General Electric T64|T64]] turboprop engines and a wide-track, large-wheel main landing gear – not proceeded with. (Fairchild Model M-541 Tactical Airlift Transport)<ref>Fairchild Hiller advert, ''Air Force and Space Digest'', Washington, D.C., January 1967, Volume 50, Number 1, pages 12–13.</ref> 
;C-123T
:Proposed upgrade for Royal Thai Air Force C-123Bs including installation of turboprop engines; cancelled after one prototype due to budgetary reasons.
;HC-123B
: USCG search and rescue variant
;UC-123K
:C-123Ks converted for ''Ranch Hand'' defoliation missions, 34 converted.
;VC-123K
:One C-123K converted as personal transport for General Westmoreland's use in Vietnam.
;[[Stroukoff YC-134]]
:One aircraft built by Stroukoff, as C-123B but fitted with boundary layer control system, tailplane endplates, redesigned landing gear with tandem main wheels. Later designated YC-134A when fitted with Pantobase landing gear.
;YC-136
:Proposed improved variant; cancelled before any aircraft built.
;B.L.4
:({{langx|th|บ.ล.๔}}) [[Royal Thai Armed Forces]] designation for the C-123B.<ref name=":1">{{Cite web |title=Thai Military Aircraft Designations |url=https://designation-systems.net/non-us/thailand.html |access-date=2025-03-19 |website=designation-systems.net}}</ref>
;B.L.4A
:({{langx|th|บ.ล.๔ก}}) Royal Thai Armed Forces designation for the C-123K.<ref name=":1" />

==Operators==
;{{BRA}}
*[[Brazilian Air Force]] – two resold to [[VARIG]]
;{{CAM}}
*[[Khmer Air Force]] - received 21 C-123Ks in 1973<ref name="am222p123">Beck 2022, p. 123</ref>
;{{TWN}}
*[[Republic of China Air Force]]
:: 34th "[[Black Bat Squadron]]", 1962 to 1973<ref name="Pocock"/>
:: 4 C-123K, retired in 1981
;{{ESA}}
*[[Air Force of El Salvador]] - received three C-123Ks in 1982<ref name="am222p123"/>
;{{LAO}}
*[[Royal Lao Air Force]] - received 10 in 1973<ref name="am222p123"/>
*[[Lao People's Liberation Army Air Force]]
;{{Flag|Philippines|1936}}
*[[Philippine Air Force]] - received 19 from 1973<ref name="am222p123"/>
;{{SAU}}
*[[Royal Saudi Air Force]] - Six C-123Bs acquired in 1957. Five returned to US in 1966–67.<ref name="am222p123"/>
[[File:C-123K ROKAF Team Spirit 1989.JPEG|thumb|A South Korean C-123K in 1989.]]
;{{KOR}}
*[[Republic of Korea Air Force]] - C-123Ks from 1973 and C-123Js from 1977<ref name="am222p123"/>
;{{Flag|South Vietnam}}
*[[Republic of Vietnam Air Force]] - 64 C-123Ks acquired 1971–72.<ref name="am222p123"/>
;{{THA}}
*[[Royal Thai Air Force]]<ref name="am222p123"/>
;{{USA}}
*[[United States Air Force]]
*[[United States Coast Guard]]
;{{VEN}}
*[[Venezuelan Air Force]] - 18 C-123Bs acquired 1958, in use until 1983<ref name="am222p123"/>

==Accidents and incidents==
[[File:ConAirC123crashdenali.JPG|thumb|right|Crash site of the C-123 from Con Air, Mount Healy, Denali National Park, Alaska]]

*9 October 1958: A C-123B Provider, AF Ser. No. 55-452, ''en route'' from [[Hill AFB]], Utah to [[McChord AFB]], Washington, with five [[United States Air Force Thunderbirds|USAF Thunderbirds]] flight crew and 14 maintenance personnel, flew through a flock of birds and crashed into a hillside six miles east of [[Payette, Idaho]], just before 1830, killing all on board.<ref>{{cite news|url=https://news.google.com/newspapers?id=lfRVAAAAIBAJ&sjid=cuIDAAAAIBAJ&pg=4331%2C1732093|title=19 Killed in Crash Of Air Force Plane, UPI report|work=Eugene (OR) Register-Guard|date=October 10, 1958|location=Payette, Idaho --An Air Force C123 plane crashed... about 10 miles east of this southwest Idaho town Thursday night..."}}</ref><ref>{{cite web|title=Keepin 'em Flying...|url=http://www.check-six.com/Crash_Sites/Thunderbirds_C-123B.htm|work=www.Check-Six.com|access-date=13 May 2013}}</ref> This accident remains the worst loss-of-life in the Thunderbirds team history.
*11 December 1964: A [[Republic of Vietnam Air Force]] C-123B (#55-4522) crashed into [[Sơn Trà Mountain]] shortly after takeoff from [[Da Nang Air Base]] killing all 38 onboard.<ref>{{cite web|url=https://aviation-safety.net/wikibase/193752|title=Accident Fairchild C-123B|publisher=Aviation Safety Network|access-date=16 November 2020}}</ref>
*11 December 1965: ''En route'' to [[Tuy Hoa Air Base]], a USAF C-123 hit some trees on top of a ridge, causing it to enter a spin and crash. Four American officers and 81 [[Republic of Vietnam Airborne Division|South Vietnamese paratroopers]] were killed.<ref>{{cite news|title=Find Wrecked Plane, 85 Dead, in S. Viet Nam|work=Chicago Tribune|date=December 24, 1965 |page=2 |url-access=limited |url=https://chicagotribune.newspapers.com/search/results/?keyword=%22Wrecked+Plane%2C+85%22+Dead%2C+in+S.+Viet+Nam}}</ref>
*24 January 1966: A C-123K operated by the USAF (Registration 54-0702) lost power and crashed after take-off from [[An Khe]], ''en route'' to [[Bong Son]]. The aircraft was transporting troops taking part in [[Operation Masher]]. The crew of four and 42 members of the [[1st Air Cavalry Division]] were killed.<ref>{{cite web|title=Crash of a Fairchild C-123K in An Khe: 46 Killed|url=https://www.baaa-acro.com/crash/crash-fairchild-c-123k-provider-khe-46-killed}}</ref>
*18 May 1966: C-123B Provider shot down in An Khe, South Vietnam.<ref>{{cite web|url=https://www.af.mil/News/Article-Display/Article/110231/missing-for-46-years-air-commando-laid-to-rest/ |title=Missing for 46 years, air commando laid to rest |date=29 October 2012 }}</ref>
*27 November 1970: A C-123K #55-4574 on approach to [[Nha Trang Air Base]] in poor visibility crashed into terrain killing six U.S. crew and 73 South Vietnamese.<ref>{{cite web|url=https://www.vietnam.ttu.edu/reports/images.php?img=/images/1683/168300010798.pdf|title=Headquarters MACV Monthly Summary November 1970|publisher=Headquarters United States Military Assistance Command, Vietnam|access-date=16 March 2020|page=20}}{{PD-notice}}</ref><ref>{{cite web|url=https://www.baaa-acro.com/crash/crash-fairchild-c-123k-provider-near-nha-trang-79-killed|title=Crash of a Fairchild C-123K Provider near Nha Trang: 79 killed|publisher=Bureau of Aircraft Accidents Archives|access-date=16 March 2020}}</ref>
*29 November 1970: A C-123K #54-0649 on approach to [[Cam Ranh Air Base]] crashed into terrain killing 42 onboard.<ref>{{cite web|url=https://www.baaa-acro.com/crash/crash-fairchild-c-123k-provider-near-cam-ranh-bay-42-killed|title=Crash of a Fairchild C-123K Provider near Cam Ranh Bay: 42 killed|publisher=Bureau of Aircraft Accidents Archives|access-date=16 March 2020}}</ref>
*27 December 1971: A C-123K enroute from [[Udorn Royal Thai Air Force Base]], to Xieng Lom located in northwestern Laos, was reportedly shot down by anti-aircraft fire approximately 35&nbsp;km east northeast of Xieng Lom resulting in the loss of four crew members. In October, 1997, a Joint Task Force (JTF 98-IL) located the crash site.  After three excavations (2017-2018) the remains of three crew members were identified.<ref>Defense POW/MIA Accounting Agency Release 19-022 March 1, 2019.</ref>
*16 October 1980: A UC-123K of the [[Ohio Air National Guard]] crashed shortly after take off ''en route'' home from [[Fort Sill, Oklahoma]] to [[Rickenbacker Air National Guard Base|Rickenbacker ANGB, Ohio]].<ref>{{cite web|url=http://aviation-safety.net/database/record.php?id=19801016-0|title=Accident Description: Fairchild UC-123K Provider, 16 October 1980|website=Aviation Safety Network|access-date= 18 December 2011}}</ref> Four crew members died on impact, the fifth died later.<ref>{{cite web|url=https://news.google.com/newspapers?id=QTMcAAAAIBAJ&sjid=TVgEAAAAIBAJ&dq=fort%20sill&pg=2553%2C4296368|title=Four killed in crash of plane|work=The Victoria Advocate|date=14 October 1980|access-date=18 December 2011}}</ref>
*6 February 1982: A [[South Korean Air Force]] C-123 [[February 1982 Korean Air Force C-123 accident|crashed into a volcano]] while on approach to [[Jeju International Airport]], killing all 53 people on board.<ref>{{cite web|url=http://aviation-safety.net/database/record.php?id=19820206-0|title=ASN Aircraft accident Fairchild C-123J Provider registration unknown Jeju (Cheju) International Airport (CJU)|first=Harro|last=Ranter|website=aviation-safety.net}}</ref>
*1 June 1982: A [[South Korean Air Force]] C-123 crashed into Mt. Choenggye, killing all 53 people on board.<ref>{{cite web|url=http://aviation-safety.net/database/record.php?id=19820601-1|title=ASN Aircraft accident Fairchild C-123J Provider 56-4391 Seoul-Seongnam Air Base (SSN)|first=Harro|last=Ranter|website=aviation-safety.net}}</ref>
*1 August 2010: The aircraft used for flying scenes in the movie ''[[Con Air]]'', C-123K, former AF Ser. No. 54-0709, FAA registration N709RR (cn: 20158), crashed in [[Denali National Park]] while performing a cargo flight for [[All West Freight]]. All three crew members died.<ref>{{cite web|url=http://wireupdate.com/wires/8300/authorities-identify-victims-of-alaska-con-air-movie-plane-crash/ |title=Authorities identify victims of Alaska Con-air movie plane crash|archive-url=https://web.archive.org/web/20100806192143/http://wireupdate.com/wires/8300/authorities-identify-victims-of-alaska-con-air-movie-plane-crash/ |archive-date=2010-08-06 |website=wireupdate.com|access-date=10 August 2010}}</ref>

==Surviving aircraft==
{{more citations needed section|date=September 2011}}
[[File:Provider@DoverAFB WilliamGrimes.JPG|thumb|right|A C-123K on display at [[Air Mobility Command Museum]] at [[Dover AFB]].]]
[[File:C-123B RTAF.jpg|thumb|C-123B displays at the Royal Thai Air Force Museum]]
[[File:Fairchild C-123K Provider '40633' (11538630533).jpg|thumb|C-123K display at the [[Museum of Aviation (Warner Robins)|Museum of Aviation]], [[Robins AFB]]]]

===Costa Rica===
* 54-0663 – El Avion restaurant in Hotel Costa Verde, Costa Rica has the twin of the CIA-operated aircraft downed by the Sandinista forces over Nicaragua in 1986. The aircraft has been converted into a bar.<ref>{{cite web|author=Antonio, Manuel|url=http://www.costaverde.com/avion01.htm|title=Hotel Costa Verde|archive-url=https://web.archive.org/web/20100107180721/http://www.costaverde.com/avion01.htm |archive-date=2010-01-07|website=costaverde.com|access-date=27 November 2010}}</ref> (Formerly 437TAW and Ranch Hand aircraft)

===El Salvador===
* 56-4375 – [[Ilopango International Airport]], El Salvador, C-123K with serial FAS-122 is on static display, this is one of the original aircraft provided by the United States Air Force to the Salvadorean Air Force during the Salvadoran Civil War. When was in service with the USAF, it was used, by General William Westmoreland, during the Vietnam War conflict, back then was called "The White Whale" VC-123B 56-4375 (AF 56-4375) which were used as VIP transports.

===Philippines===
* 54-0624 – C-123K [[Mactan Air Base|Benito Ebuen AFB]], Mactan Island, Philippines <ref>{{cite web | url=https://www.flickr.com/photos/158583312@N02/53999280151/in/photostream/ | title=54624 | date=16 September 2024 }}</ref>
* 54-0525 - C-123K Camp Enrile, Zamboanga City, Philippines<ref>{{cite web|url=https://www.jetphotos.com/photo/10651942|website=JetPhotos.com|title=54525 Fairchild C-123K Provider}}</ref>

===South Korea===
*[[Gimhae Air Base]]
* 54-0687 – [[Muan International Airport]]
* 55-4509 – [[Jeju Aerospace Museum]]
* 55-4564 - [[KAI Aerospace Museum]], Sacheon
* 56-4360 – Jinpo maritime Theme park, Gunsan
* 56-4386/9 – [[War Memorial of Korea]], [[Seoul]]

===Thailand===
* 54-0555 – [[Royal Thai Air Force Museum]], [[Don Muang AFB]].<ref>{{cite web|url=http://www.rtaf.mi.th/museum/OUTDOOR-2.HTM#c123b|title=Outdoor display|archive-url=https://web.archive.org/web/20121122025746/http://www.rtaf.mi.th/museum/OUTDOOR-2.HTM |archive-date=2012-11-22|website=Royal Thai Air Force Museum|access-date=18 December 2012}}</ref>
* 54-0576 – Jesada Technik Museum, Thailand, C-123K (aircraft used in ''Operation Dumbo Drop'')
* UNKNOWN – [[Caltex]] gas station, Bang Whua subdistrict, Bang [[Pakong district]], [[Chachoengsao province]], Thailand. Retired C-123B of the Royal Thai Air Force converted into a cafe called "Coffee 123" or more popularly known by the locals as the airplane cafe.<ref>{{cite web|url=https://www.key.aero/article/thailands-crazy-airliner-conversions-illustrated-tour|title=Thailand's crazy airliner conversions: An illustrated tour|date=15 August 2023 |access-date=2 August 2024}}</ref>

===United States===
* 54-0580 – [[Pima Air and Space Museum]] (adjacent to [[Davis-Monthan AFB]]), Tucson, Arizona, C-123(B)K (On loan from US Forest Service)<ref>{{cite web|title=Provider/54-0580|url=http://www.pimaair.org/aircraft-by-name/item/fairchild-c-123k-provider|website=Pima Air and Space Museum|access-date=20 April 2019}}</ref>
* 54-0593 – Wilford Hall Medical Center, [[Lackland AFB]], Texas<ref>{{cite web|title=Provider/54-0593|url=http://www.warbirdregistry.org/c123registry/c123-540593.html|website=Warbird Registry|publisher=Warbird Resource Group|access-date=20 April 2015}}</ref>
* 54-0604 – [[Dyess AFB]], Texas, C-123K (on loan from [[NMUSAF]])
* 54-0609 – [[Fort Bragg (North Carolina)|Fort Bragg]], North Carolina, 82nd Airborne Division War Memorial Museum, C-123K <ref>{{cite web | url=https://www.cnn.com/2023/06/02/politics/fort-bragg-liberty-renamed-base-us-army/index.html | title=US Army renames Fort Bragg as Fort Liberty &#124; CNN Politics | website=[[CNN]] | date=2 June 2023 }}</ref>
* 54-0610 – [[Hill Aerospace Museum]], [[Hill AFB]], Utah, C-123K (on loan from NMUSAF).<ref>{{cite web|url=http://www.hill.af.mil/library/factsheets/factsheet.asp?id=5689|title=C-123K ''Provider''|archive-url=https://web.archive.org/web/20121215012017/http://www.hill.af.mil/library/factsheets/factsheet.asp?id=5689 |archive-date=2012-12-15|website=Hill Aerospace Museum|access-date=18 December 2012}}</ref>
* 54-0612 – [[March Joint Air Reserve Base|March ARB]], California, [[March Field Air Museum]], C-123K (on loan from NMUSAF).<ref>{{cite web|url=http://www.marchfield.org/c123k.htm|title=Fairchild C-123K Provider|archive-url=https://web.archive.org/web/20121213142807/http://www.marchfield.org/c123k.htm |archive-date=2012-12-13 |website=March Field Air Museum|access-date=18 December 2012}}</ref>
* 54-0629 – [[McGuire AFB]], [[Trenton, New Jersey]]<ref>{{cite web|title=Provider/54-0629|url=http://www.warbirdregistry.org/c123registry/c123-540629.html|website=Warbird Registry|publisher=Warbirds Resource Group|access-date=20 April 2015}}</ref>
* 54-0633 – [[Robins AFB]], Georgia, [[Museum of Aviation (Warner Robins)|Museum of Aviation]], C-123B (on loan from NMUSAF).<ref>{{cite web|url=http://www.museumofaviation.org/C123.php|title=Fairchild C-123K ''Provider''|archive-url=https://web.archive.org/web/20120224113147/http://www.museumofaviation.org/C123.php |archive-date=2012-02-24|website=Museum of Aviation|access-date=18 December 2012}}</ref>
* 54-0658 – [[Dover AFB]], Delaware, [[Air Mobility Command Museum]], C-123K (on loan from NMUSAF).<ref>{{cite web|url=http://amcmuseum.org/at-the-museum/aircraft/c-123k-provider/ |title=C-123K Provider|website=Air Mobility Command Museum|access-date= 18 December 2012}}</ref>
* 54-0664 – [[Air Heritage Aviation Museum]] in [[Beaver Falls, Pennsylvania]]; this museum's C-123K, nicknamed "Thunder Pig", is operational and available for air shows.<ref>{{cite web|url=https://airheritage.org/aircraft/fairchild-c-123k-provider-thunderpig/ |title=Fairchild C-123K Provider Thunderpig|website=Air Heritage Museum|access-date=20 Jan 2023}}</ref><ref>{{Cite web |last=Leone |first=Dario |date=2023-07-05 |title=Video shows last flying C-123 Provider almost crashing while landing in heavy Crosswinds at Geneseo Airshow |url=https://theaviationgeekclub.com/video-shows-last-flying-c-123-provider-almost-crashing-while-landing-in-heavy-crosswinds-at-geneseo-airshow/ |access-date=2023-08-06 |website=The Aviation Geek Club |language=en-GB}}</ref>
* 54-0668 – [[Lackland AFB]], Texas, C-123K (on loan from NMUSAF)
* 54-0669 – [[Pope Army Airfield|Pope AAF]] (former [[Pope AFB]]), North Carolina, Pope Air Park, C-123K (painted as AF Ser. No. 54-0372) (on loan from NMUSAF)
* 54-0674 – Air America Foundation, Inc., owns a C-123K, housed at [[Space Coast Regional Airport]], Titusville, Florida.<ref>{{cite web|url=http://www.airamfoundation.org/ouraircraft.php|title=Our Aircraft|publisher=Air America Foundation|access-date=18 December 2012}}</ref>
* 54-0683 – [[Air Force Flight Test Museum]], California, C-123K sitting alongside a [[C-119 Flying Boxcar]] on an unused runway south of the [[air base]]. This aircraft was auctioned off in early 2016.<ref>{{cite web|url=https://gsaauctions.gov/gsaauctions/aucdsclnk?sl=91QSCI16034503|title=Scrap Aircraft|website=Government Services Administration|access-date=6 May 2017|archive-url=https://web.archive.org/web/20220807170433/https://gsaauctions.gov/gsaauctions/aucdsclnk?sl=91QSCI16034503|archive-date=7 August 2022}}</ref>
* 54-0692 – [[SpringHill Camps]], [[Evart, Michigan]]. This C-123K has been repurposed as a camp cabin for year-round use.<ref>{{cite web|url=https://issuu.com/springhillcamps/docs/2013springnewsletter|title=Spring Newsletter 2013|date=11 March 2013 |page=4|publisher=SpringHill Camps}}</ref>
* 54-0695 – [[Mid-America Transportation and Aviation Museum]], [[Sioux City, Iowa]].<ref>{{cite news|last1=Burrish|first1=Sam|title=Fairchild C-123 will centerpiece museum|url=http://siouxcityjournal.com/news/fairchild-c--will-centerpiece-museum/article_3eb6f45f-3705-5a25-8253-07f7465f267c.html|website=SiouxCityJournal.com|date=16 August 2007 |publisher=Sioux City Journal|access-date=20 April 2015}}</ref>
* 55-4505 – [[Pima Air and Space Museum]] (adjacent to [[Davis-Monthan AFB]]), Tucson, Arizona, C-123B (on loan from NMUSAF, former Ranch Hand aircraft)
* 55-4507 – [[Travis AFB]], California, Travis Air Museum, C-123K (on loan from NMUSAF).<ref>{{cite web|url=http://jimmydoolittlemuseum.org/index.html|title=Outdoor exhibits: Fairchild C-123K ''Provider''|website=Jimmy Doolittle Air and Space Museum Foundation|access-date=18 December 2012}}</ref>
* 55-4512 – [[Castle Airport]] (former [[Castle AFB]]), California, [[Castle Air Museum]], C-123K (on loan from NMUSAF).<ref>{{cite web|url=http://www.castleairmuseum.org/fairchild_c123k.html|title=Fairchild C-123K Provider|archive-url=https://web.archive.org/web/20130106043250/http://www.castleairmuseum.org/fairchild_c123k.html |archive-date=2013-01-06|website=Castle Air Museum|access-date=18 December 2012}}</ref>
* 55-4533 – [[Hurlburt Field]], Florida, Hurlburt Field Memorial Air Park, C-123K (on loan from NMUSAF)
* 55-4558 – [[Museum of Alaska Transportation & Industry]], [[Wasilla Airport]], Alaska, C-123J
* 55-4567 – [[Little Rock AFB]], Arkansas, C-123K (on loan from NMUSAF)
* 56-4361 – [[Wendover Airport]], [[Wendover, Utah]], C-123K<ref>{{cite web|last1=van der Voet|first1=Aad|title=C-123 Providers starring in "Con Air"|url=http://www.oldwings.nl/content/con_air/con_air.htm|website=Old Wings|access-date=20 April 2015}}</ref>
* 56-4362 – [[National Museum of the United States Air Force]], [[Wright-Patterson AFB]], Ohio, C-123K (''Patches'', former Ranch Hand aircraft).<ref>{{cite web|url=https://www.nationalmuseum.af.mil/Visit/Museum-Exhibits/Fact-Sheets/Display/Article/196059/fairchild-c-123k-provider/|title=Fairchild C-123K Provider|website=National Museum of the U.S. Air Force|access-date=29 August 2015}}</ref>
* 56-4395 – Former [[Kulis ANGB]], Anchorage, Alaska, C-123J (on loan from NMUSAF)

Several other examples of C-123s remain in an active flying status, operated by private owners in the United States or by various air forces worldwide.<ref>{{cite web|title=C-123 Survivors From Operation Ranch Hand Vietnam|url=http://www.ranchhandvietnam.org/csurvivors|website=ABOUT OPERATION RANCH HAND VIETNAM SOUTHEAST ASIA 1961–1971|access-date=19 April 2015}}</ref><ref>{{cite web|title=Fairchild C-123 Provider Census|url=http://www.oldprops.ukhome.net/C123%20Census.htm|website=Oldprops|access-date=20 April 2015}}</ref>

==Specifications (C-123K Provider)==
[[File:Fairchild C-123B Provider 3-view line drawing.png|frameless|right|3-view line drawing of the Fairchild C-123B Provider]]

{{Aircraft specs
|ref=The Observer's Book of Basic Aircraft: Military (dimensions),<ref name="Obseversbasic p214-5">Green 1967, pp. 214–215.</ref> Jane's All The World's Aircraft 1969–70 (weights and performance)<ref name="JAWA69 p323-4">Taylor 1969, pp. 323–324.</ref>
|prime units?=imp
<!--
        General characteristics
-->
|crew=4
|capacity=60 passengers, 50 litters, or {{convert|24000|lb|kg}} of cargo
|length ft=76
|length in=3
|length note=
|span ft=110
|span in=0
|span note=
|height ft=34
|height in=1
|height note=
|wing area sqft=1223
|wing area note=
|aspect ratio=<!-- sailplanes -->
|airfoil=[[NACA airfoil|NACA 23017]]<ref name="Selig">{{cite web |last1=Lednicer |first1=David |title=The Incomplete Guide to Airfoil Usage |url=https://m-selig.ae.illinois.edu/ads/aircraft.html |website=m-selig.ae.illinois.edu |access-date=16 April 2019}}</ref>
|empty weight lb=35366
|empty weight note=
|gross weight lb=51576
|gross weight note=
|max takeoff weight lb=60000
|max takeoff weight note=
|fuel capacity={{convert|1462|USgal|impgal L|abbr=on}} internal + 2x {{convert|450|USgal|impgal L|abbr=on}} underwing drop-tanks<ref name=JAWA58-59>Bridgman 1958, p. 303.</ref>
|more general=
<!--
        Powerplant
-->
|eng1 number=2
|eng1 name=[[Pratt & Whitney R-2800-99W Double Wasp]]
|eng1 type=18-cylinder air-cooled radial piston engines
|eng1 hp=2500
|eng1 note=

|eng2 number=2
|eng2 name=[[General Electric J85-GE-17]]
|eng2 type=[[turbojet]] engines
|eng2 lbf=2850
|eng2 note=

|prop blade number=3
|prop name=[[Hamilton Standard]] constant-speed fully feathering reversible-pitch propellers
|prop dia ft=<!-- propeller aircraft -->
|prop dia in=<!-- propeller aircraft -->
|prop dia note=
<!--
        Performance
-->
|max speed mph=228
|max speed note=at {{cvt|10000|ft|0}}
|cruise speed mph=173
|cruise speed note=maximum at {{cvt|10000|ft|0}}
|stall speed mph=95
|stall speed note=flaps and undercarriage down
|never exceed speed mph=
|never exceed speed note=
|minimum control speed mph=
|minimum control speed note=
|range miles=1035
|range note=with maximum payload
|combat range miles=
|combat range note=
|ferry range miles=3280
|ferry range note=with 2x {{cvt|500|USgal|impgal l}} "Benson" auxiliary tanks
|endurance=<!-- if range unknown -->
|ceiling ft=21100
|ceiling note=with one engine inoperative
|climb rate ftmin=1220
|climb rate note=at sea level with one engine inoperative
|time to altitude=
|wing loading lb/sqft=
|wing loading note=
|fuel consumption lb/mi=
|power/weight=

|more performance=<br />
*'''Take-off run:''' {{cvt|1167|ft|0}}
*'''Take-off distance to {{cvt|50|ft|0}}:''' {{cvt|1809|ft|0}}
*'''Landing distance from {{cvt|50|ft|0}}:''' {{cvt|1800|ft|0}}

|avionics=
}}

==Notable appearances in media==
[[File:Jailbird.jpg|thumb|Fairchild C-123 used for static and taxi scenes in ''[[Con Air]]'' (1997), at Wendover Airfield, c. 2011]]

{{main|Aircraft_in_fiction#C-123_Provider|l1=Aircraft in fiction: C-123 Provider}}
A C-123K (54-709), N709RR (since destroyed in a crash in 2010) was prominently featured in the action film ''[[Con Air]]'' (1997); other C-123s appeared in [[Air America (film)|''Air America'']] (1990), ''[[Outbreak (1995 film)|Outbreak]]'' (1995), ''[[Operation Dumbo Drop]]'' (1995) and [[American Made (film)|''American Made'']] (2017), none of which were used in [[Operation Ranch Hand]].<ref>{{Cite book|url=https://www.nap.edu/read/18848/chapter/10|doi = 10.17226/18848|title = Post-Vietnam Dioxin Exposure in Agent Orange-Contaminated C-123 Aircraft|year = 2015|pmid = 26042319|isbn = 978-0-309-30890-8}}</ref><ref>{{Cite web|url=https://www.vetshq.com/happened-c-123-aircraft/|title = What Happened to C-123 Aircraft}}</ref>

==See also==
{{Aircontent
|related=
* [[Chase XCG-20]]
* [[Chase XC-123A]]
* [[Stroukoff YC-134]]
|similar aircraft=
* [[Aeritalia G.222]]
* [[Antonov An-8]]
* [[Blackburn Beverley]]
|lists=
* [[List of military aircraft of the United States]]
|see also=
}}

==References==

===Notes===
{{Reflist|group=N}}

===Citations===
{{Reflist}}

===Bibliography===

*Andrade, John. ''U.S. Military Aircraft Designations and Serials since 1909''. Leichester, UK: Midland Counties Publications, 1979. {{ISBN|0-904597-22-9}}.
* Beck, Simon D. "Database: Fairchild C-123 Provider". ''[[Aeroplane Monthly|Aeroplane]]'', February 2022, Vol. 50, No. 2, pp.&nbsp;115–131. {{ISSN|0143-7240}}
*Boerschig Jr, Charles A. ''Black Spot Special Activities Report.'' Ubon, Thailand: Black Spot Task Force, 1969.
* Bridgman, Leonard. ''Jane's All the World's Aircraft 1958-59''. London: Sampson Low, Marston & Company, Ltd., 1958. 
*Davis, Larry. ''Gunships: A Pictorial History of Spooky.'' Carrollton, Texas: Squadron/Signal Publications, 1982.
*Green, William. ''The Observer's Basic Book of Aircraft: Military''. London: Frederic Warne, 1967.
*Green, William and Gerald Pollinger. ''The Aircraft of the World''. London: Macdonald, 1955.
*Gunston, Bill. ''The Encyclopedia of World Air Power''. New York: Crescent Books, 1980a. {{ISBN|0-517-53754-0}}.
*Gunston, Bill, ed. ''The Illustrated Encyclopedia of Commercial Aircraft.'' New York: Exeter Books, 1980b. {{ISBN|978-0-89673-077-9}}.
* Gunston, Bill. ''The Illustrated Encyclopedia of the World's Modern Military Aircraft''. London: Salamander Books, 1977. {{ISBN|0-86101-010-8}}.
*Halliday, John T. ''Flying Through Midnight.'' London: New Scribner/Lisa Drew Book, 2007. {{ISBN|978-0-7432-7488-3}}.
*Smith, C.M. ''History of the Black Spot Task Force, 29 July 1968–11 May 1969.'' Eglin Air Force Base, Florida: Black Spot Task Force, undated.
*[[John W. R. Taylor|Taylor, John W. R.]] ''Jane's All The World's Aircraft 1969–70''. London: Sampson Low, Marston & Company, 1969. {{ISBN|0-354-00051-9}}.

==External links==
{{Commons}}
*[https://web.archive.org/web/20060305102804/http://medalofhonor.com/JoeMJackson.htm Joe M. Jackson's mission in C-123 that earned him a Medal of Honor]
*[http://www.oldwings.nl/content/c123t/c123t.htm Page detailing the world's only C-123T "Turbo Provider" conversion]

{{Chase aircraft}}
{{Fairchild aircraft}}
{{USAF transports}}
{{Thai transport aircraft designations}}

{{Authority control}}

[[Category:Chase aircraft|C-123 Provider]]
[[Category:Fairchild aircraft|C-123 Provider]]
[[Category:1950s United States military transport aircraft|Fairchild C-123 Provider]]
[[Category:High-wing aircraft]]
[[Category:Aircraft with auxiliary jet engines]]
[[Category:Aircraft first flown in 1949]]
[[Category:Twin piston-engined tractor aircraft]]
[[Category:Aircraft with retractable tricycle landing gear]]