F-111A Aardvark Vietnam

The General Dynamics F-111 Aardvark was a supersonic, medium-range interdictor and tactical attack aircraft that also filled the roles of strategic nuclear bomber, aerial reconnaissance, and electronic-warfare aircraft in its various versions. Developed in the 1960s by General Dynamics, it first entered service in 1967 with the United States Air Force. The F-111 pioneered several technologies for production aircraft, including variable-sweep wings, afterburning turbofan engines, and automated terrain-following radar for low-level, high-speed flight. Its design influenced later variable-sweep wing aircraft, and some of its advanced features have since become common.

67-113 was delivered to the USAF on 14 August 1969 and assigned to the 474th TFW at Nellis AFB NV.
It was deployed to Takhli RTAFB Thailand for CONSTANT GUARD V on 27 September 1972 with 430 TFS assigned to the 347th TFW "tail code HG "
It flew the last F-111 combat mission of the Vietnam war 17 April 1973. The F-111A's of the 347th TFW at Korat continued flying combat missions in Cambodia in support of Khmer Republic forces until 15 August 1973 when US combat support ceased.
67-0113 was purchased by RAAF as an attrition replacement in 1982 .

Alternative: Combat Lancer
The first production F-111A deliveries to the USAF took place on 18 July 1967 to the 428th, 492nd and 430th Tactical Fighter Squadrons of the 474th Tactical Fighter Wing based at Cannon AFB, New Mexico (USA). In early 1968, the wing was reassigned to Nellis AFB, Nevada.
Shortly thereafter, the USAF decided to rush a small detachment of F-111As to Southeast Asia under a program known as "Combat Lancer". Six 428th TFS F-111As were allocated to the "Combat Lancer" program, and departed Nellis AFB for Takhli RTAFB on 15 March 1968. By the end of that month, 55 night missions had been flown against targets in North Vietnam, but two aircraft had been lost. 66-0022 had been lost on 28 March, and 66-0017 on 30 March. Replacement aircraft had left Nellis, but the loss of a third F-111A (66-0024) on 22 April halted F-111A combat operations until 1972.
It turned out that the three F-111A losses were not due to enemy action but were caused by wing and tail structural defects.