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On August 18, 2012, retired astronaut Charlie Walker appeared in the Astronaut Encounter at the Kennedy Space Center Visitor Complex. Commercial industry’s first astronaut, Walker flew on three Space Shuttle missions -- STS-41D in 1984, STS-51D in 1985 and STS-61B in 1985. Walker flew on those missions as a Payload Specialist representing McDonnell-Douglas. He designed their Electrophoresis Operations in Space experiment. He trained four Shuttle crews to perform the experiment, then performed it himself
