Lockheed D-21
The D-21 was originally designed to be launched at supersonic speed from the back of an M-21 carrier aircraft (the M-21 was a modification of the A-12 design). In July 1966, a D-21 collided with its M-21 after release, destroying both and resulting in the death of one of the M-21’s two crew members. No further "piggyback" launches were attempted. (U.S. Air Force photo)
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