Astronaut Alan B. Shepard Jr., one of three NASA astronauts chosen for the Project Mercury first manned suborbital flight, prepares for testing in a capsule of the U.S. Navy's centrifuge at Johnsville, Pennsylvania. Original photo number was 61-MR3-19
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Astronaut Alan B. Shepard Jr., one of three NASA astronauts chosen for the Project Mercury first manned suborbital flight, prepares for testing in a capsule of the U.S. Navy's centrifuge at Johnsville, Pennsylvania. Original photo number was 61-MR3-19