First Untethered, Free Flight, Bruce McCandless II, Naval Aviator

He was responsible for crew inputs to the development of hardware and procedures for the Inertial Upper Stage (IUS), Space Telescope, the Solar Maximum Repair Mission, and the Space Station Program.
McCandless logged over 312 hours in space, including four hours of MMU flight time. He flew as a mission specialist on STS-41-B and STS-31.
STS-41-B: Challenger launched from Kennedy Space Center, Florida, on February 3, 1984. The flight deployed two communications satellites, and flight-tested rendezvous sensors and computer programs for the first time.