The LTV A-7 Corsair II finished up being a light assault aircraft based on the F-8 Crusader. The A-7 ended up being one of the primary 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 as well as the usa Air Force, and soon after utilising the Air National Guard. It turned out additionally exported to South Vietnam (throughout the Vietnam War), Greece (A-7H), Portugal(A-7P), and Thailand (into the belated 1980s)