M61-00150 (1961) --- Astronaut John H. Glenn Jr., suited with hose to suit ventilation unit attached, during altitude chamber test. He is standing in the entrance to the test chamber with his helmet visor down. Photo credit: NASA
M61-00150 (1961) --- Astronaut John H. Glenn Jr., suited with hose to suit ventilation unit attached, during altitude chamber test. He is standing in the entrance to the test chamber with his helmet visor down. Photo credit: NASA