Kelly Johnson’s Most Dangerous Gamble: The M-21 Mothership & D-21 Drone. Step inside the secretive world of Lockheed Skunk Works as legendary engineer Kelly Johnson unveils one of the Cold War’s most ambitious and perilous projects: Project Tagboard. This restored footage captures the intensity of the development phase for the M-21 carrier aircraft and its supersonic payload, the D-21 reconnaissance drone. While the SR-71 Blackbird is globally famous, its predecessor, the A-12, birthed a highly

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