Project Manhigh was a pre-Space Age military project that took men in balloons to the middle layers of the stratosphere, funded as an aero-medical research program, though seen by its designers as a stepping stone to space. It was conducted by the United States Air Force between 1955 and 1958.[1]
- ^ "Space Men: They were the first to brave the unknown (Transcript)". American Experience. PBS. 1 March 2016. Retrieved 2 January 2019.