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- Location: Tucson - Davis-Monthan AFB (DMA / KDMA) , USA - Arizona October 9, 1994
Wow! This was a find in AMARC in 1994. The previously highly secret Lockheed GTD-21B 'Project Tagboard' Mach 3.3 recon drone. The D-21 program was highly classified and few details have been released. The program was canceled in 1971.