NOVA/PBS NOVAPBS
D-21 (USA)
With the Cold War at its height, the need for high-quality reconnaissance images was greater than ever. Yet several embarrassing aerial surveillance mishaps, including the shooting-down of Gary Powers' U-2 spy plane over Russia in 1960, convinced the CIA that work on a new UAV, invulnerable to attack, should begin immediately. The U.S. government gave Lockheed the job of developing a high-speed, ultra-stealth UAV.

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