The NASA M2-F2 was a Northrop-built heavyweight lifting-body research aircraft flown in the joint NASA/USAF program to study controllable wingless atmospheric-reentry shapes. Its first glide flight was July 12, 1966; after 16 glide missions, a May 10, 1967 landing accident damaged the vehicle, which NASA and Northrop rebuilt and redesignated as the improved M2-F3 with a center fin.
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