The LTV A-7 Corsair II had been a light assault aircraft on the basis of the F-8 Crusader. The A-7 had been among the first combat aircraft to feature a head-up display (HUD). doppler-bounded inertial navigation system, and a turbofan engine. It served with both united states of america Navy plus the usa Air Force, and later with the Air nationwide Guard. It absolutely was also exported to South Vietnam (through the Vietnam War), Greece (A-7H), Portugal(A-7P), and Thailand (in belated 1980s)