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Astronaut John H. Glenn Jr. (left), Dr. William Douglas, astronauts flight surgeon, and equipment specialist Joe Schmitt walk down a hall as they leave crew quarters prior to Mercury-Atlas 6 (MA-6) mission.

John Glenn prepares for his Mercury-Atlas 6 flight

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.

Image Credit: NASA
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