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Walter Marty Schirra Jr., an American astronaut, was born on March 12, 1923, in Hackensack, New Jersey. He was part of the renowned Mercury Seven astronauts and was a key figure in NASA's early space program. Schirra flew on three space missions: Mercury-Atlas 8, Gemini 6A, and Apollo 7, making him one of the most experienced astronauts of his time.