After unsuccessfully applying for NASA's
second and
third astronaut selections, Swigert was accepted into the
NASA Astronaut Corps as part of
NASA Astronaut Group 5 in April 1966. Swigert became a specialist on the
Apollo command module: he was one of the few astronauts who requested to be command module pilots. Swigert was a member of
Apollo 7's astronaut support crew, the first support crew for an Apollo mission; he served as
capsule communicator (CAPCOM) during the ascent phase of the flight.
Apollo 13 command module Odyssey's square
carbon dioxide scrubber cartridges to fit the
Apollo Lunar Module Aquarius, which took a round cartridge Swigert was one of three astronauts aboard the
Apollo 13 Moon mission launched April 11, 1970. Originally part of the backup crew for the mission, he was assigned to the mission three days before launch, replacing astronaut
Ken Mattingly. The prime crew had been exposed to
German measles (the rubella virus) from
Charles Duke and, because Mattingly had no immunity to the disease, NASA did not want to risk him falling ill during critical phases of the flight. Apollo 13 was the third crewed lunar-landing attempt, but was aborted after the rupture of an oxygen tank in the spacecraft's
service module. Swigert was the astronaut who first announced, "
Houston, we've had a problem here". The statement was then repeated by commander of the flight
Jim Lovell. Swigert, along with fellow astronauts Lovell and
Fred Haise, traveled around the Moon and returned safely to Earth on April 17 after about 5 days and 23 hours, and received the
Presidential Medal of Freedom the next day.
Apollo–Soyuz Test Project NASA Director of Flight Crew Operations
Deke Slayton, who selected the astronauts, recommended Swigert as
command module pilot for the
Apollo–Soyuz Test Project, the first joint mission with the
Soviet Union. Slayton felt Swigert deserved another chance to fly after having been selected for Apollo 13 two days before launch, and performing well. During 1972, the
Apollo 15 postal covers incident caused NASA investigators to inquire into other astronauts. A number of Apollo astronauts, including Swigert, had made agreements with West German stamp dealer Hermann Sieger, who originated the idea for the
Apollo 15 covers, to autograph philatelic items in exchange for a payment of about $2,500. Swigert originally denied involvement when interviewed by NASA investigators. According to
Christopher C. Kraft, the investigators subpoenaed his bank records, finding more funds than expected, and records of a predated charitable donation. Swigert's subsequent admission caused NASA Deputy Administrator
George M. Low to remove him from Apollo–Soyuz. ==Post-NASA career==