Stock Photo - Astronaut Alan B. Shepard Jr. has his heart rate checked prior to his Mercury-Redstone 3 (MR-3) mission, the first American manned suborbital spaceflight. The attending physician is Dr. William K. Douglas.

Stock Photo: Astronaut Alan B. Shepard Jr. has his heart rate checked prior to his Mercury-Redstone 3 (MR-3) mission, the first American manned suborbital spaceflight.

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