Bruce McCandless II (June 8, 1937 - December 21, 2017) was a U.S. naval officer and aviator, electrical engineer, and NASA astronaut.
He made the first untethered free flight by using the Manned Maneuvering Unit. At the age of 28, McCandless was selected as the youngest member of NASA Astronaut Group 5 (labelled the "Original Nineteen" by John W. Young) in April 1966.