The Vultee P-66 Vanguard was a United States Army Air Forces fighter aircraft. It was initially ordered by Sweden, but by the time the aircraft were ready for delivery in 1941, the United States would not allow them to be exported, designating them as P-66s and retaining them for defensive and training purposes. 100 aircraft from the Swedish order agreed to take into service Great Britain, expecting to use them as training. The aircraft, designated Vanguard Mk.1, were intended to be used at Canadian airfields to train fighter pilots.