G60-02402 (1960) --- Astronaut Alan B. Shepard Jr. prepares for testing in a capsule of the U.S. Navy's centrifuge at Johnsville, Pennsylvania. Photo credit: NASA or National Aeronautics and Space Administration
G60-02402 (1960) --- Astronaut Alan B. Shepard Jr. prepares for testing in a capsule of the U.S. Navy's centrifuge at Johnsville, Pennsylvania. Photo credit: NASA or National Aeronautics and Space Administration