William Arthur Pailes (Colonel, USAF) (born June 26, 1952) was a USAF astronaut in the Manned Spaceflight Engineer Program during the mid-1980s. He served as a Payload Specialist on STS-51-J Atlantis (October 3–7, 1985).
STS-51-J was the twenty-first space shuttle mission and the maiden flight of the Space Shuttle Atlantis. It was the second mission dedicated to deploying a Department of Defence payload. It was a classified mission however we do know that it deployed two 10 satellites.Low Earth Orbit