Bruce McCandless II (born June 8, 1937), (Capt, USN, Ret.), is a former American naval officer and aviator, electrical engineer, and former NASA astronaut. During the first of his two Space Shuttle missions he made the first ever untethered free flight using the Manned Maneuvering Unit in 1984.
This famous image shows McCandless using the MMU duringSTS-41-B in 1984
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.
This mission marked the first checkout of the Manned Maneuvering Unit (MMU) and Manipulator Foot Restraint (MFR). McCandless made the first untethered free flight on each of the two MMUs carried on board, thereby becoming the first person ever to make an untethered spacewalk.
After eight days in orbit, Challenger made the first landing on the runway at Kennedy Space Center on February 11, 1984.
On this five-day Discovery flight, launched on April 24, 1990 from the Kennedy Space Center in Florida, the crew deployed the Hubble Space Telescope from their record-setting altitude of 380 miles (612 km).
Discovery landed at Edwards Air Force Base, California, on April 29, 1990.