Photos: Historic D-21
Static displays of a D-21 Drone (left) and a SR-71 Blackbird shine in the morning sun March 14, 2013 on Beale Air Force Base, Calif. D-21 drones were designed for high altitude aerial reconnaissance in the 1960s and were launched from modified A-12 Blackbirds known as M-21s, predecessors of the SR-71. (U.S. Air Force photo by Airman 1st Class Bobby Cummings/Released)
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CummingsReleased
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