The X-20 Dyna-Soar (“Dynamic Soarer”) was a United States Air Force (USAF) program to develop a spaceplane that could be used for a variety of military missions, including reconnaissance, bombing, space rescue, satellite maintenance, and sabotage of enemy satellites. The program ran from 24 October 1957-10 December 1963, cost US$660 million, and was canceled just after spacecraft construction had begun.
Strangled Infant: The Boeing X-20A Dyna-Soar by Clarence Geiger
https://documents.theblackvault.com/documents/dynasoar/AFD-080408-031.pdf
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