File:Astronaut John H. Glenn Undergoing Respiratory Testing in Preparation for His Friendship 7 Flight.png
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Categories:
- April 1961 United States photographs
- Black and white photographs of men at work
- Black and white photographs of the United States in the 1960s
- Front views of topless men
- John Glenn in 1961
- Men at work in the 1960s
- Men facing right and looking right in the United States
- Mercury program training
- Noseclip
- Respiratory function tests
- Topless male astronauts
- Topless men in the United States
- 1961 black and white photographs of people