Astronaut John H. Glenn Jr. (left); Dr. William Douglas, astronauts' flight surgeon; and equipment specialist Joe Schmitt leave crew quarters prior to Mercury-Atlas 6 (MA-6) mission. Glenn is in his pressure suit and is carrying the portable ventilation unit.

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Photo credit: © NASA Archive / Alamy / Afripics
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Keywords: ., american, astronaut, astronauts, exploration, glenn, historic, historical, history, john, jr., mission, nasa, people, person, space