Project Mercury mission (1962) In February 1959, Schirra was one of 110 military test pilots selected by their commanding officers as candidates for the newly formed
National Aeronautics and Space Administration's
Project Mercury, the first U.S. crewed space flight program. Following several rounds of tests, Schirra became a member of the
original seven astronauts selected for the program in April 1959. At 7:15am on October 3, 1962, Schirra lifted off aboard his Mercury flight, named
Sigma 7. After a minor trajectory deviation early in flight,
Sigma 7 achieved orbit. Once in orbit, Schirra demonstrated manually positioning and maneuvering his spacecraft using a reaction control system. After the navigation issues during Carpenter's
Aurora 7 mission, NASA and Schirra focused on the engineering and human factors in manually operating the capsule. Schirra reported rising suit temperatures, reaching a high of , before he was able to adjust his suit's cooling system manually. After completing his spacecraft tests, Schirra tested his ability to use controls in a zero-gravity environment without sight. Throughout his mission, Schirra demonstrated the ability to act as a backup to automatic controls and manually fly the spacecraft.
Project Gemini At the beginning of the Gemini program,
Alan Shepard was assigned to command
Gemini 3 with
Tom Stafford as the pilot, but they were replaced by a backup crew after Shepard was diagnosed with
Ménière's disease, a disorder of the inner ear. Schirra and Stafford became the backup crew for the new
Gemini 3 crew,
Gus Grissom and
John Young, and were subsequently scheduled for the Gemini 6 primary crew. Gemini 6 was originally scheduled to perform the first orbital docking with an
Agena target vehicle. The Agena vehicle exploded during its launch into orbit on October 25, 1965, while Schirra and Stafford waited in their spacecraft to lift off. Program managers decided that rather than wait for a replacement Agena to be available, they would revise the mission, calling it Gemini 6A and having it attempt a rendezvous with
Gemini 7, to be flown by
Frank Borman and
Jim Lovell. On December 4, 1965, Gemini 7 lifted off to begin its two-week mission. While on the Gemini mission, Schirra played a
Christmas practical joke on the flight controllers by first reporting a mock
UFO (implying
Santa Claus) sighting, then playing "
Jingle Bells" on a four-hole
Hohner harmonica he had
smuggled on board, accompanied by Stafford on sleigh bells.
Apollo program ,
First Lady Lady Bird Johnson, President
Johnson,
NASA Administrator Webb and
Vice President Humphrey (1968) In mid-1966, Schirra was assigned to command a three-man
Apollo crew with
Donn F. Eisele and
R. Walter Cunningham to make the second crewed flight test of the
Apollo Command/Service Module, with a mission profile identical to
Apollo 1. Schirra argued against a repeat mission, and his crew became the backup crew for
Gus Grissom,
Ed White, and
Roger Chaffee. Schirra's crew conducted tests in the command module on January 26, 1967, and were en route to Houston the next day when Grissom and his crew were killed in a fire during a test. Schirra's crew became the prime crew of the first crewed flight. This became
Apollo 7 in the program's revised mission numbering plan, and was delayed until the fall of 1968 while safety improvements were made to the Command Module. However, Schirra was prevented from naming his spacecraft
Phoenix in honor of the
Apollo 1 crew, because some believed that its nickname as a metaphor for "fire" might be misunderstood. Apollo 7 was launched on October 11, 1968, making Schirra the first person to fly in space three times. Prior to launch, Schirra had objected because of high winds, which could have injured the astronauts in the event of an abort within the first minute of the mission. After reaching orbit, the Apollo 7
CSM performed
space rendezvous and docking exercises with the
S-4B stage to simulate retrieving the
Apollo Lunar Module. On the second day of the mission, the crew conducted the first live
television pictures publicly broadcast from inside a crewed spacecraft. and left the
NASA Astronaut Corps on July 1, 1969. Schirra's last assignment as an astronaut was to conduct the investigation into
Neil Armstrong's
Lunar Landing Research Vehicle crash, which he attributed to a mechanical failure and recommended suspending training with the vehicle. On the same date, Schirra retired from the Navy with the rank of
Captain. == Post-NASA career ==