Question: Which astronaut flew on the Apollo 7 becoming NASA's 3rd civilian astronaut after Neil Armstrong and Elliot See?

Context paragraphs:
NASA's Story: NASA's Story is a documentary series by Dangerous Films for the BBC to commemorate 50 years since the formation of NASA.  The series looks at NASA's early history, the triumphs and disasters, notably the Apollo 1 fire, through to the manned Moon missions and the Space Shuttle era.  The show includes various interviews with astronauts and NASA personnel such as Chris Kraft, Jon Clark, Leroy Cain, Scott Carpenter, Neil Armstrong and Buzz Aldrin, both crew members of Apollo 11.

First Man: The Life of Neil A. Armstrong: First Man: The Life of Neil A. Armstrong is the official biography of Neil Armstrong, the astronaut who became the first man to walk on the Moon on July 20, 1969.  Written by James R. Hansen, it was published in 2005 by Simon & Schuster.  The book describes Armstrong's involvement in the United States space program, culminating with the fateful Apollo 11 mission, while also detailing his personal life and upbringing.

List of Apollo astronauts: Thirty-two astronauts were assigned to fly in the Apollo manned lunar landing program.  Twenty-four of them left Earth's orbit and flew around the Moon on nine missions.  (Of the other manned missions, Apollo 1 did not launch and Apollo 7 and Apollo 9 were low Earth orbit spacecraft testing missions).  In addition, nine astronauts flew Apollo spacecraft in the Apollo Applications Programs Skylab and Apollo–Soyuz Test Project.

The Astronaut Monument: The Astronaut Monument is a monument about the training of Apollo astronauts in northern Iceland during the 1960s, located outside The Exploration Museum in Húsavík.  The monument contains the names of 32 Apollo astronauts that were sent to Iceland for training in geology for manned lunar missions, and has two steel globes on top of two basalt columns, representing the Earth and the Moon.  The monument was unveiled on July 15, 2015, by the grandchildren of Apollo 11 astronaut Neil Armstrong.

NASA Astronaut Group 2: NASA's Astronaut Group 2, also known as The New Nine, was the second group of astronauts selected by NASA and announced on September 17, 1962.  The group was required to augment the original Mercury 7 with the announcement of the Gemini program and leading to the Apollo program.  While the Original 7 had been selected to accomplish the simpler task of orbital flight, the new challenges of rendezvous and lunar landing led to the selection of candidates with advanced engineering degrees (for four of the New Nine) as well as test pilot experience.  Two of this group had been candidates for the original 7, but were not selected then for medical reasons.  In addition, Group 2 became the first group with civilian test pilots in the group; See flew for General Electric, while Armstrong flew the X-15 research plane for NASA.

Walter Cunningham: Ronnie Walter Cunningham (born March 16, 1932), (Col, USMCR, Ret.) , better known as Walter Cunningham, is a retired American astronaut.  In 1968, he was a Lunar Module Pilot on the Apollo 7 mission.  He was NASA's third civilian astronaut (after Neil Armstrong and Elliot See), and has also been a fighter pilot, physicist, entrepreneur, venture capitalist, author of "The All-American Boys", lecturer, and host of the radio show "Lift-off to Logic".  Walter Cunningham attended UCLA.

1966 NASA T-38 crash: The 1966 NASA T-38 crash occurred when a NASA Northrop T-38 Talon crashed at Lambert Field in St. Louis, Missouri, on February 28, 1966, killing two Project Gemini astronauts, Elliot See and Charles Bassett.  The aircraft, piloted by See, crashed into the McDonnell Aircraft building where their "Gemini 9" spacecraft was being assembled.  The weather was poor with rain, snow, fog, and low clouds.  A NASA panel, headed by the Chief of the Astronaut Office, Alan Shepard, investigated the crash.  While the panel considered possible medical issues or aircraft maintenance problems, in addition to the weather and air traffic control factors, the end verdict was that the crash was caused by pilot error.

Wally Schirra: Walter Marty "Wally" Schirra Jr. (March 12, 1923 – May 3, 2007), (CAPT, USN), was an American naval officer and aviator, aeronautical engineer, test pilot, and one of the original seven astronauts chosen for Project Mercury, United States first effort to put humans in space.  He flew the six-orbit, nine-hour Mercury-Atlas 8 mission on October 3, 1962, becoming the fifth American, and the ninth human, to ride a rocket into space.  In the two-man Gemini program, he achieved the first space rendezvous, station-keeping his Gemini 6A spacecraft within 1 ft of the sister Gemini 7 spacecraft in December 1965.  In October 1968, he commanded Apollo 7, an 11-day low Earth orbit shakedown test of the three-man Apollo Command/Service Module.  He was the first person to go into space three times, and the only person to have flown in Mercury, Gemini, and Apollo, logging a total of 295 hours and 15 minutes in space.  He retired from the U.S. Navy at the rank of Captain and from NASA after his Apollo flight, becoming a consultant to CBS News for its coverage of the subsequent Apollo flights.  He joined Walter Cronkite as co-anchor for the seven Moon landing missions.

Gemini 9A: Gemini 9A (officially Gemini IX-A) was a 1966 manned spaceflight in NASA's Gemini program.  It was the 7th manned Gemini flight, the 13th manned American flight and the 23rd spaceflight of all time (includes X-15 flights over 100 km ).  The original crew for Gemini 9, command pilot Elliot See and pilot Charles Bassett, were killed in a crash on February 28, 1966 while flying a T-38 jet trainer to the McDonnell Aircraft plant in St. Louis, Missouri to inspect their spacecraft.  The mission was flown June 3–6, 1966 by backup command pilot Thomas P. Stafford and pilot Eugene Cernan.  The astronauts rendezvoused with the Augmented Target Docking Adaptor, but were unable to dock with it because the nose fairing failed to eject from the docking target due to a launch preparation error.  Cernan performed a two-hour extravehicular activity, during which he was planned to demonstrate free flight in a self-contained rocket pack, the Astronaut Maneuvering Unit.  He was unable to accomplish this due to stress, fatigue, and overheating.

Elliot See: Elliot McKay See Jr. (July 23, 1927 February 28, 1966) was an American engineer, naval aviator, test pilot, and NASA astronaut, selected in the second group of astronauts.  Chosen as the prime command pilot for what would have been his first space flight, Gemini 9, he was killed with his crewmate Charles Bassett in a 1966 NASA trainer jet crash at the St. Louis, Missouri McDonnell Aircraft plant, where they were to take two weeks of space rendezvous simulator training.

Supporting paragraphs: Walter Cunningham Elliot See
Answer: Ronnie Walter Cunningham