Discovery awaits its final takeoff. In 1985, its crew (bottom, center) made the first all-military mission.


The oldest astronaut to travel aboard a space shuttle


was John Glenn, who was 77 years old when he flew aboard STS-95 in October 1998. In 1962, he became the first American to orbit the Earth.


(above) In 2011, Endeavor is docked at the Space Station on its final mission, STS-134, which includ- ed delivery of the Alpha Magnetic Spectrometer that measures cosmic rays. Columbia (far left) lifts off in 1982 on the fourth shuttle mission, the first to include a DoD payload.


PHOTOS: CLOCKWISE FROM TOP, DIMITRI GERONDIDAKIS/NASA; NASA; NASA MARSHALL SPACE FLIGHT CENTER; DOD


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