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Glenn was a fighter pilot in both World War II and the Korean War. He became one of America's original seven Mercury astronauts and orbited Earth three times on 20 February 1962 in the capsule Friendship 7. 

Glenn was elected senator from Ohio in 1974, serving until 1998, and ran unsuccessfully for the Democratic presidential nomination in 1984 and 1988.

He returned to orbit in late 1998, joining the crew of the space shuttle Discovery in a mission that became a nostalgic salute to a space pioneer.

Thank You John Glenn, American hero.