Colonel Robert Franklyn "Bob" Overmyer was an American test pilot, naval aviator, aeronautical engineer, physicist, United States Marine Corps officer and USAF/NASA astronaut. Overmyer was selected by the Air Force as an astronaut for its Manned Orbiting Laboratory in 1966. Upon cancellation of this program in 1969, he became a NASA astronaut and served support crew duties for the Apollo program, Skylab program and Apollo-Soyuz Test Project. In 1976, he was assigned to the Space Shuttle program and flew as pilot on STS-5 in 1982 and as commander on STS-51-B in 1985. He was selected as a lead investigator into the Space Shuttle Challenger disaster and retired from NASA in 1986. Ten years later, Overmyer died in Duluth, Minnesota while testing the Cirrus VK-30 composite homebuilt aircraft.