The F-8 Crusader was a single-engine aircraft carrier-based air superiority fighter aircraft built by Vought. It replaced the Vought F-7 Cutlass. The first F-8 prototype was ready for flight in February 1955, and was the last American fighter with guns as the primary weapon, principally serving in the Vietnam War. The RF-8 Crusader was a photo-reconnaissance development and operated longer in U.S. service than any of the fighter versions. RF-8s played a crucial role in the Cuban Missile Crisis, providing essential low-level photographs impossible to acquire by other means.US Naval Reserve units continued to operate the RF-8 until 1987