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The NASA Astronaut Corps is a unit of the United States National Aeronautics and Space Administration (NASA) that selects, trains, and provides astronauts as crew members for U.S. and international space missions.
The first U.S. astronaut candidates were selected by NASA in 1959, for its Project Mercury with the objective of orbiting astronauts around the Earth in single-man capsules. The military services were asked to provide a list of military test pilots who met specific qualifications. After stringent screening, NASA announced its selection of the "Mercury Seven" as its first astronauts. Since then, NASA has selected 20 more groups of astronauts, opening the corps to civilians, scientists, doctors, engineers, and school teachers.
NASA selects candidates from a diverse pool of applicants with a wide variety of backgrounds. From the thousands of applications received, only a few are chosen for the intensive Astronaut Candidate training program. Including the “Original Seven”, only 339 candidates have been selected to date.
The Astronaut Corps is based at the Lyndon B. Johnson Space Center, although members may be assigned to other locations based on mission requirements, e.g. Soyuz training at Star City, Russia.
The Chief of the Astronaut Office is the most senior leadership position for active astronauts in the Corps. The Chief Astronaut serves as head of the Corps and is the principal adviser to the NASA Administrator on astronaut training and operations. The first Chief Astronaut was Deke Slayton, appointed in 1962. The current Chief Astronaut is Robert Behnken, and is assisted by Eric Boe as Deputy Chief Astronaut.
Salaries for civilian astronauts are based upon the U.S. Federal Government's General Schedule pay scale for grades GS-11 through GS-14. The grade is determined in accordance with each individual's academic achievements and experience. Currently a GS-11 starts at $64,724 per year and a GS-14 can earn up to $141,715 per year.
Military astronauts are detailed to the Johnson Space Center and remain in an active duty status for pay, benefits, leave, and other similar military matters.
There are no age restrictions for the NASA Astronaut Corps. Astronaut candidates have ranged between the ages of 26 and 46, with the average age being 34. Candidates must be U.S. citizens to apply for the program, though applicants with valid U.S. dual-citizenship are also eligible.
There are three broad categories of qualifications: education, work experience, and medical.
Candidates must have a bachelor's degree from an accredited institution in engineering, biological science, physical science or mathematics. The degree must be followed by at least three years of related, progressively responsible, professional experience (graduate work or studies) or at least 1,000 pilot-in-command time in jet aircraft. An advanced degree is desirable and may be substituted for experience (master's degree = 1 year or a doctoral degree = 3 years). Teaching experience, including experience at the K - 12 levels, is considered to be qualifying experience.
Candidates must have the ability to pass the NASA long-duration space flight physical, which includes the following specific requirements:
- Distant and near visual acuity: Must be correctable to 20/20, each eye
- The refractive surgical procedures of the eye, PRK and LASIK, are allowed, providing at least 1 year has passed since the date of the procedure with no permanent adverse after effects.
- Blood pressure not to exceed 140/90 measured in a sitting position
- Standing height between 62 and 75 inches
As of August 2012[update] the corps has 53 active astronauts and 41 "management astronauts" ("employed at NASA but are no longer eligible for flight assignment"). The highest number of active astronauts at one time, was in 2000 when there were 149. Nearly all of the current astronaut corps are from the classes of 1996 (Group 16) or later; only three remain in the Corps from classes prior to that.
There are currently 14 "international active astronauts" ("those international astronauts who are assigned to duties at the Johnson Space Center") who were selected by their home agency but trained with and serve alongside their NASA counterparts. International astronauts, Payload Specialists, and Spaceflight Participants are not considered members of the NASA Astronaut Corps.
Astronaut Candidates 
The term "Astronaut Candidate" (informally known as "ASCAN") refers to individuals who have been selected by NASA as candidates for the NASA Astronaut Corps and are currently undergoing a candidacy training program at the Johnson Space Center. The next class of Astronaut Candidates will be selected in 2013. Upon completion of a two-year training program, they will be promoted to the rank of Astronaut.
Former members 
Selection as an Astronaut Candidate and subsequent promotion to Astronaut does not guarantee the individual will eventually fly in space. A number of people have voluntarily resigned or been medically disqualified after being chosen an astronaut but prior to being selected for a flight.
Civilian candidates are expected to remain with the Corps for at least five years following initial training while military candidates are assigned for specific tours. Following that, members of the Astronaut Corps may resign/retire at any time.
Three members of the Astronaut Corps were killed during a ground test accident while preparing for the Apollo 1 mission. Eleven were killed during spaceflight, on Space Shuttle missions STS-51-L and STS-107. An additional four (Elliot See, Charles Bassett, Theodore Freeman, and Clifton Williams) were killed in T-38 plane crashes during training for space flight during the Gemini and Apollo programs. Another was killed in a 1967 automobile accident, and another died in a 1991 commercial airliner crash while traveling on NASA business.
Selection groups 
- 1959 Group 1 - "The Mercury Seven"
- 1962 Group 2 - "The New Nine"
- 1963 Group 3 - "The Fourteen"
- 1965 Group 4 - "The Scientists"
- 1966 Group 5 - "The Original 19"
- 1967 Group 6 - "The Excess Eleven (XS-11)"
- 1969 Group 7
- 1978 Group 8 - "Thirty-Five New Guys (TFNG)" (class included first female candidates)
- 1980 Group 9 - "19+80"
- 1984 Group 10 - "The Maggots"
- 1985 Group 11
- 1987 Group 12 - "The GAFFers"
- 1990 Group 13 - "The Hairballs"
- 1992 Group 14 - "The Hogs"
- 1994 Group 15 - "The Flying Escargot"
- 1996 Group 16 - "The Sardines" (largest class to date, 35 NASA candidates and nine international astronauts)
- 1998 Group 17 - "The Penguins"
- 2000 Group 18 - "The Bugs"
- 2004 Group 19 - "The Peacocks"
- 2009 Group 20 - "The Chumps"
- 2013 Group 21 - To be named
See also 
- Canadian Astronaut Corps
- European Astronaut Corps
- List of astronauts by selection
- Human spaceflight
- History of spaceflight
- NASA - Astronaut Selection
- NASA - Astronaut Selection
- - Astronaut Candidate Program
- How Many Astronauts Does NASA Need? (Dec. 7, 2010)
- Three Payload Specialists were also killed on the two missions.
- NASA Astronaut Candidate Program Brochure
- Current NASA Astronaut Corps Members
- Former NASA Astronaut Corps Members