The LTV A-7 Corsair II was a light assault aircraft on the basis of the F-8 Crusader. The A-7 was one of the primary combat aircraft to feature a head-up display (HUD). doppler-bounded inertial navigation system, and a turbofan motor. It served using the usa Navy as well as the united states Air Force, and after with the Air nationwide Guard. It turned out also exported to South Vietnam (through the Vietnam War), Greece (A-7H), Portugal(A-7P), and Thailand (in belated 1980s)