MARINER 10: NASA ASTRONAUTS Six astronauts sign this envelope in commemoration of one of their missions First Day Cover Signed: "John S.

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MARINER 10: NASA ASTRONAUTS Six astronauts sign this envelope in commemoration of one of their missions First Day Cover Signed: "John S. Bull", "Bob Overmyer", "Anthony Llewellyn", "Don Peterson", "Karol Bobko" and "Don Lind" 6½x3½. First day cover of the 10¢ Mariner 10 Space Mission stamp. Postmarked Pasadena, California, April 4, 1975. JOHN S. BULL (1934-2008) was selected as a NASA astronaut in 1966 after he served nearly ten years in the U.S. Navy. He resigned from NASA in 1968 after being diagnosed with pulmonary disease, making him automatically ineligible to travel to space. Bull went on to earn a Ph.D. from Stanford University and he rejoined NASA to conduct research from 1973-1985. COLONEL BOB OVERMYER flew as a pilot in the STS-5 (1982) and as commander on the STS-51-B (1985). He also was named lead investigator for the Challenger disaster in 1986. ANTHONY LLEWELLYN (1933-2013) was a chemist and NASA astronaut, first selected to join the NASA astronaut program as a space candidate in 1967. As a member of Astronaut Group 6, he participated in flight training but ultimately quit the program in 1968 when he couldn't pass the rigorous flight training requirements, particularly the "flying blind" test. Instead, he began teaching at the University of South Florida, where he conducted groundbreaking research in bioelectrochemistry, designing monitoring instruments for living human tissue. DON PETERSON (b. 1933) is a West Point graduate who was selected to become a NASA astronaut in 1969. After serving as a support crew member for Apollo 16 (1972), he served as a mission specialist on STS-6 in 1983, conducting experiments and testing new equipment. COLONEL KAROL J. BOBKO (b. 1937) became a NASA astronaut in 1969 and participated in the Skylab Medical Experiment Altitude Test (SMEAT) just three years later. The ground simulation was essential to future Skylab missions. He later flew on the Challenger STS-6 (1983), Discovery STS-51-D (1985) and Atlantis STS-51J (1985). Bobko became the first astronaut to fly on three different space shuttles. DON LIND (b. 1930) is a NASA astronaut and physicist who was among the "Original Nineteen" selected for the Apollo program. He designed many of the tools used on the Apollo missions and went on the STS-51-B science mission in 1985. After his career with NASA ended in 1986, he taught at Utah State University for nearly a decade. Fine condition.

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