The LTV A-7 Corsair II had been a light attack aircraft in line with 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 the united states of america Navy as well as the united states of america Air Force, and soon after with all the current Air nationwide Guard. It had been in addition exported to South Vietnam (throughout the Vietnam War), Greece (A-7H), Portugal(A-7P), and Thailand (in the belated 1980s)