Question: What project did an American aerospace engineer, test pilot, United States Air Force pilot, and one of the seven original astronauts, also referred to as the Original Seven or Astronaut Group 1, participate in?

Context paragraphs:
Jack Swigert: John Leonard "Jack" Swigert Jr. (August 30, 1931 – December 27, 1982) was an American test pilot, mechanical and aerospace engineer, United States Air Force pilot, and NASA astronaut, one of the 24 people who have flown to the Moon.

Gordon Cooper: Leroy Gordon "Gordo" Cooper Jr. (March 6, 1927 – October 4, 2004), (Col, USAF), better known as Gordon Cooper, was an American aerospace engineer, test pilot, United States Air Force pilot, and one of the seven original astronauts in Project Mercury, the first manned space program of the United States.

Stuart Roosa: Stuart Allen "Stu" Roosa (August 16, 1933 – December 12, 1994), (Col, USAF), was an American aeronautical engineer, United States Air Force pilot, test pilot, and NASA astronaut, who was the Command Module Pilot for the Apollo 14 mission.  The mission lasted from January 31 to February 9, 1971 and was the third mission to land astronauts (Alan Shepard and Edgar Mitchell) on the Moon.  While Shepard and Mitchell spent two days on the lunar surface, Roosa conducted experiments from orbit in the Command Module "Kitty Hawk".  He was one of only 24 people to travel to the Moon.

U.S. Air Force Test Pilot School: The U.S. Air Force Test Pilot School (USAF TPS) is the Air Force's advanced flight training school that trains experimental test pilots, flight test engineers, and flight test navigators to carry out tests and evaluations of new aerospace weapon systems and also other aircraft of the U.S. Air Force.  This school was established on 9 September 1944 as the Flight Test Training Unit at Wright-Patterson Air Force Base (AFB) in Dayton, Ohio.  To take advantage of the uncongested skies, usually superb flying weather, and the lack of developed zones in the event of crashing, the test pilot school was officially moved to its present location at Edwards Air Force Base in the northwestern Mojave Desert of Southern California on 4 February 1951.

James Irwin: James Benson "Jim" Irwin (March 17, 1930 – August 8, 1991) (Col, USAF) was an American astronaut, aeronautical engineer, test pilot, and a United States Air Force pilot.  He served as lunar module pilot for Apollo 15, the fourth human lunar landing.  He was the eighth person to walk on the Moon and the first, and youngest, of those astronauts to die.

Karol J. Bobko: Karol Joseph "Bo" Bobko (born December 23, 1937), (Col, USAF, Ret.) , is an American aerospace engineer, retired U.S. Air Force officer, test pilot, and a former USAF and NASA astronaut.

Aircraft Research and Development Unit RAAF: The Royal Australian Air Force's Aircraft Research and Development Unit (ARDU) plans, conducts and analyses the results of ground and flight tests of existing and new Air Force aircraft.  ARDU consists of four flights located at RAAF Bases Edinburgh, Amberley, Richmond and Williamtown, staffed by qualified test pilots, flight test engineers and flight test system specialists.  Up until 2016 the Squadron also conducted flight test for the Australian Army with Army personnel also working within the unit.  The flight test crew are long course trained at test pilot schools including the United States Air Force Test Pilot School, the United States Naval Test Pilot School, the Empire Test Pilots' School, the École du personnel navigant d'essais et de réception and the National Test Pilot School.

Neil Armstrong: Neil Alden Armstrong (August 5, 1930 – August 25, 2012) was an American astronaut, engineer, and the first person to walk on the Moon.  He was also an aerospace engineer, naval aviator, test pilot, and university professor.  Before becoming an astronaut, Armstrong was an officer in the U.S. Navy and served in the Korean War.  After the war, he earned his bachelor's degree at Purdue University and served as a test pilot at the National Advisory Committee for Aeronautics (NACA) High-Speed Flight Station, where he logged over 900 flights.  He later completed graduate studies at the University of Southern California.

Mercury Seven: The Mercury Seven were the group of seven Mercury astronauts announced by NASA on April 9, 1959.  They are also referred to as the Original Seven or Astronaut Group 1.  They piloted the manned spaceflights of the Mercury program from May 1961 to May 1963.  These seven original American astronauts were Scott Carpenter, Gordon Cooper, John Glenn, Gus Grissom, Wally Schirra, Alan Shepard, and Deke Slayton.

NASA Astronaut Group 5: NASA's Astronaut Group 5 was selected by NASA in April 1966.  Of the six Lunar Module Pilots that walked on the Moon, three came from Group 5.  The group as a whole is roughly split between the half who flew to the Moon (nine in all) and the other half who flew Skylab and Shuttle, providing the core of Shuttle Commanders early in that program.  This group is also distinctive in being the only time when NASA hired a person into the astronaut corps who had already earned astronaut wings, X-15 pilot Joe Engle.  John Young labelled the group the "Original Nineteen" in parody of the original seven Mercury astronauts.

Supporting paragraphs: Mercury Seven Gordon Cooper
Answer: Project Mercury