STS-51-D | Shuttle: Discovery | Launch: April 12, 1985 Kneeling from left to right: Karol J. Bobko (commander), Donald E. Williams (pilot), Margaret Rhea Seddon (payload commander), Jeffrey A. Hoffman (mission specialist), Standing from left to right: S. David Griggs (mission specialist), Charles D. Walker (payload specialist), Jake Garn (payload specialist)