The LTV A-7 Corsair II had been a light attack aircraft based on the F-8 Crusader. The A-7 finished up being one of many primary combat aircraft to feature a head-up display (HUD). doppler-bounded inertial navigation system, and a turbofan motor. It served with both usa Navy as the usa Air Force, and soon after with all the current Air nationwide Guard. It had been also exported to Southern Vietnam (through the Vietnam War), Greece (A-7H), Portugal(A-7P), and Thailand (within the belated 1980s)