Kerwin was selected for
NASA Astronaut Group 4 as a scientist-astronaut in June 1965. He was serving as a pilot and a flight surgeon for the Navy at the time of his selection. He was one of the
capsule communicators (CAPCOMs) on
Apollo 13 (in 1970). Kerwin served as Science Pilot for the
Skylab 2 (SL-2) mission which launched on May 25 and splashed down on June 22, 1973. With him for the initial activation and 28-day flight qualification operations of the
Skylab Orbital Workshop were
Charles "Pete" Conrad (spacecraft commander) and
Paul J. Weitz (Pilot). Kerwin was subsequently in charge of the on-orbit branch of the
Astronaut Office, where he coordinated astronaut activity involving
rendezvous,
satellite deployment and retrieval, and other
Space Shuttle payload operations. Kerwin was part of the
NBC broadcasting team for coverage of the launch of
STS-1. From 1982–83, Kerwin served as NASA's senior science representative in
Australia. In this capacity, he served as liaison between NASA's Office of Space Tracking and Data Systems and Australia's
Commonwealth Scientific and Industrial Research Organisation. During this time, Kerwin was considered to fly on the mission that would become
STS-41-C (then known as STS-13), but his assignment in Australia prevented his selection. From 1984–1987, Kerwin served as Director of Space and Life Sciences at the
Johnson Space Center. There, he was responsible for direction and coordination of medical support to operational crewed spacecraft programs, including health care and maintenance of the astronauts and their families; for direction of life services, supporting research and light experiment project; and for managing JSC earth sciences and scientific efforts in lunar and planetary research. In 1986, he issued a report on the deaths of the crew killed in the
Challenger disaster to Associate Administrator for Space Flight,
Richard H. Truly. == Post-NASA career ==