STS-27 was a space shuttle mission by NASA using the Space Shuttle Atlantis. It was the 27th shuttle mission, and the 3rd for Atlantis, 2nd after the Challenger disaster. It carried a payload for the U.S. Department of Defense. Crew (total flights to date in parentheses) Robert L. Gibson (3), Commander Guy S. Gardner (1), Pilot Richard M. Mullane (2), Mission Specialist Jerry L. Ross (2), Mission Specialist William M. Shepherd (1), Mission Specialist Mission parameters Mass: 14,500? kg Pa… (More on Sts-27)