EVA At the age of 28, McCandless was selected as the youngest member of
NASA Astronaut Group 5 (jokingly labeled the "Original Nineteen" by
John W. Young) in April 1966. According to space historian Matthew Hersch, McCandless and Group 5 colleague
Don L. Lind were "effectively treated ... as scientist-astronauts" (akin to those selected in the
fourth and
sixth groups) by NASA due to their substantial scientific experience, an implicit reflection of their lack of the
test pilot experience highly valued by
Deke Slayton and other NASA managers at the time; this ultimately delayed their progression in the flight rotation. He served as
mission control capsule communicator (CAPCOM) on
Apollo 11 during the launch and during the first lunar moonwalk (
EVA) by
Neil Armstrong and
Buzz Aldrin before joining the astronaut support crew for the
Apollo 14 mission, on which he doubled as a CAPCOM. Thereafter, McCandless was reassigned to the
Skylab program, where he received his first crew assignment as backup pilot for the space station's
first crewed mission alongside backup commander
Rusty Schweickart and backup science pilot
Story Musgrave. Following this assignment, he again served as a CAPCOM on
Skylab 3 and
Skylab 4. Notably, McCandless was a co-investigator on the M-509 astronaut maneuvering unit experiment that was flown on Skylab; this eventually led to his collaboration on the development of the
Manned Maneuvering Unit (MMU) used during Space Shuttle
EVAs. Although he was classified as a Shuttle pilot until 1983, McCandless ultimately chose to work on the MMU as a
mission specialist due to the prestige of the program (which ensured a flight assignment) and his lack of test pilot experience. He was responsible for crew inputs to the development of hardware and procedures for the
Inertial Upper Stage (IUS),
Hubble Space Telescope, the
Solar Maximum Repair Mission, and the
International Space Station program.
STS-41-B (MMU) during , photographed by
Robert Gibson 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. On February 11, 1984, after eight days in orbit,
Challenger made the first landing on the runway at Kennedy Space Center.
Discovery landed at
Edwards Air Force Base,
California, on April 29, 1990. ==After NASA==