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In the 1960s, Lockheed’s secret Skunk Works built a drone so advanced it made spy planes look slow. The D-21 was a Mach 3+, 90,000-foot reconnaissance drone launched from the back of an A-12 and later a B-52. Designed to photograph enemy territory and self-destruct before capture, it pushed Cold War technology to the limit. This short dives ...
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