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Alden Metcalf

Dyna-Soar in space was never to be, for the program was canceled in December 1963. One of reasons was the development of a new type of aerospace plane, the lifting body.

Orbiting Stations: Stopovers to Space Travel
Irwin Stambler
G.P. Putnam’s Sons, 1965

X-20 Dyno-Soar at Astronautix

Image credit: Boeing

Image source: Numbers Station