Astronaut Alan B. Shepard Jr. is being helped into the lower half of his pressure suit for the Mercury-Redstone 3 (MR-3) flight, the first American manned spaceflight. Photo credit: NASA
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Astronaut Alan B. Shepard Jr. is being helped into the lower half of his pressure suit for the Mercury-Redstone 3 (MR-3) flight, the first American manned spaceflight. Photo credit: NASA