Gas turbine technology gave birth to the turbojet engine during the 1940s, ushering in the jet age. Paralleling turbojet development, the fledgling rocket engine was ready to make a grandiose debut. But aeronautical advances weren't limited to propulsion technology - the time was also right for incorporating a swept wing into a full-scale aircraft. The Douglas D-558-1 Skystreak, D-558-2 Skyrocket, and X-3 Stiletto were among the first aircraft to...