Project Mercury was the first U.S. program designed to put humans in space. It resulted in 6 flights using one-man capsules and Redstone and Atlas rockets . This goal was achieved by NASA's Apollo program and Shepard himself walked on the moon as commander of the Apollo 14 mission. Virgil Grissom died in a tragic fire during an Apollo launch pad test in 1967. Senator John Glenn will fly again on the 25th voyage of the Space Shuttle Discovery.
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