The Grumman F11F-1 Tiger was a supersonic fighter jet for the US Navy, serving for only a brief 5-year period from 1956 to 1961. The F11F-1 is remembered most by an operational incident where it 'shot itself down', the first jet aircraft to ever do so. Originally developed as an improvement for the F9F Cougar, the F11F-1 incorporated the transonic area rule, all-moving elevators and leading-edge slats to improve supersonic maneuverability. Despite its impressive design the Tiger suffered from high accident rates and was ultimately replaced by the much more well-known F-8 Crusader in Navy service after 1961.