Nearly 35,000 people contributed in substantive ways to the space flight of Astronaut John Glenn. Besides his fellow astronauts and a staff of 2,000 at Cape Canaveral, 15,000 men stood by for recovery or rescue operations on ships stretched across the Atlantic, 500 technicians manned 18 tracking stations on four continents and two oceans, and 15,000 scientists, technicians and factory workers who had labored for nearly four years on the space program left their imprint on the flight. Among members of this huge team, five men stand out:

Robert R. Gilruth, 48, director of...

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