This photo displays typical high-speed research aircraft that made headlines at Muroc Flight Center in the 1950s. Clockwise from lower left: the Bell X-1A, Douglas D-558-a Skystreak, Convair XF92-A, Bell X-5 with variable sweepback wings, Douglas D-558-II Skyrocket, Northrop X-4, and the Douglas X-3 in the center.

Credits - NASA