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As an advisor, Walker works with commercial space firms Space Adventures, Ltd and Deep Space Industries, Inc., and the Commercial Spaceflight Federation. Walker is a professional engineer registered in California. He has been an expert witness testifying before committees of the U.S. Congress.
Apollo 11 space-flown silver Robbins Medallion from the first spaceflight to land on the Moon.Presented to Wally Schirra by Neil Armstrong.. NASA space-flown Gemini and Apollo medallions were mission-specific commemorative medallions, often astronaut-designed, which were approved by NASA and carried aboard the mission spacecraft into orbit.
Brown became an astronaut in June 1985 after being selected in May 1984, and qualified for assignment as a mission specialist on future Space Shuttle flight crews. In December 1985, he was assigned to the crew of STS-61-N , a Department of Defense mission which was canceled due to the Challenger disaster .
Robert Lee "Hoot" Gibson (born October 30, 1946), (Capt, USN, Ret.), is a former American naval officer and aviator, test pilot, and aeronautical engineer.A retired NASA astronaut, he also served as Chief of the Astronaut Office from 1992 to 1994.
Jeffrey Alan Hoffman (born November 2, 1944) is an American former NASA astronaut and currently a professor of aeronautics and astronautics at MIT.. Hoffman made five flights as a Space Shuttle astronaut, including the first mission to repair the Hubble Space Telescope in 1993, when the orbiting telescope's flawed optical system was corrected. [1]
David McDowell Brown (April 16, 1956 – February 1, 2003) was a United States Navy captain and NASA astronaut. He died on his first spaceflight, when the Space Shuttle Columbia disintegrated during orbital reentry into the Earth's atmosphere. Brown became an astronaut in 1996 but had not served on a space mission prior to the Columbia disaster.