North American Aviation X-15 56-6670 with Boeing NB-52A Stratofortess 52-003, first USAF flight, Robert M. White 13 April 1960 December 20, 2012Full resolution (1141 × 786) ← Previous Next → North American X-15 56-6670 with Major Robert M. White, USAF, under the wing of NB-52A 52-003, 13 April 1960. (NASA)