Question: NASA's Story is a documentary series by Dangerous Films for the BBC to commemorate 50 years since the formation of NASA, the show includes various interviews with astronauts and NASA personnel such as which American engineer and former astronaut, he was one of the first two humans to land on the Moon, and the second person to walk on it?
Context: David Randolph Scott (born June 6, 1932) (Col, USAF, Ret.)  is an American former NASA astronaut, retired U.S. Air Force officer and former test pilot.  He belonged to the third group of NASA astronauts, selected in October 1963.  As an astronaut, Scott became the seventh person to walk on the Moon. Buzz Aldrin (born Edwin Eugene Aldrin Jr.; January 20, 1930) is an American engineer and former astronaut.  As the Lunar Module Pilot on Apollo 11, he was one of the first two humans to land on the Moon, and the second person to walk on it.  He set foot on the Moon at 03:15:16 on July 21, 1969 (UTC), following mission commander Neil Armstrong.  He is a former U.S. Air Force officer with the Command Pilot rating.  He also went into orbit on the Gemini 12 mission, finally achieving the goals for EVA (space-walk work) that paved the way to the Moon and success for the Gemini program; he spent over five hours on EVA on that mission. 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. 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. Challenger is a 1990 American disaster drama television film based on the events surrounding the Space Shuttle "Challenger" disaster.  Its production was somewhat controversial as the families of the astronauts generally objected to it.  The film concentrates on the safety inspections and arguments surrounding the O-rings that ultimately were blamed for the explosion of "Challenger".  While doing this, it also aims to show the personal humanity of the seven crew members.  Generally, the film supports the Space Shuttle program and the dedication of NASA personnel in general while criticizing NASA management. Mamta Patel Nagaraja is an American engineer.  She has degrees in aerospace engineering, mechanical engineering and biomedical engineering.  During her career at NASA, Nagaraja trained astronauts and operated as one of NASA’s certified flight controllers for the communications system of their Mission Control Center.  In 2011, Nagaraja was awarded NASA’s Exceptional Service Medal.  She is currently Project Manager for the Women at Nasa project.  The project is a joint initiative between NASA and the White House Council on Women and Girls aimed at inspiring other women and young girls to pursue careers in science, technology, engineering and math. NASA's Astronaut Group 8 was the first selection in nine years of astronaut candidates since Group 7 in August 1969.  Due to the long delay between the last Apollo lunar mission in 1972 and the first flight of the Space Shuttle in 1981, few astronauts from the older groups stayed with NASA.  On January 16, 1978 a new group of 35 astronauts, including NASA's first female astronauts, was selected.  Since then, a new group of candidates has been selected roughly every two years. Alan LaVern Bean (born March 15, 1932), (CAPT, USN, Ret.) , is an American former naval officer and Naval Aviator, aeronautical engineer, test pilot, and NASA astronaut; he was the fourth person to walk on the Moon.  He was selected to become an astronaut by NASA in 1963 as part of Astronaut Group 3.  He made his first flight into space aboard Apollo 12, the second manned mission to land on the Moon, at the age of thirty-seven years in November 1969.  He made his second and final flight into space on the Skylab 3 mission in 1973, the second manned mission to the Skylab space station.  After retiring from the United States Navy in 1975 and NASA in 1981, he pursued his interest in painting, depicting various space-related scenes and documenting his own experiences in space as well as that of his fellow Apollo program astronauts. Guion Stewart Bluford Jr., Ph.D. (born November 22, 1942), (Col, USAF, Ret.) , is an American aerospace engineer, retired U.S. Air Force officer and fighter pilot, and former NASA astronaut, who was the first African American in space.  Before becoming an astronaut, he was an officer in the U.S. Air Force, where he remained while assigned to NASA, rising to the rank of Colonel.  He participated in four Space Shuttle flights between 1983 and 1992.  In 1983, as a member of the crew of the Orbiter "Challenger" on the mission STS-8, he became the first African American in space as well as the second person of African ancestry in space, after Cuban cosmonaut Arnaldo Tamayo Méndez. Joseph Richard "Joe" Tanner (born January 21, 1950) is an American instructor at the University of Colorado Boulder, mechanical engineer, a former naval officer and aviator, and a former NASA astronaut.  He was born in Danville, Illinois.  He is unusual among astronauts as he did not have a background in flight test nor did he earn any advanced academic degrees.  Typically those who did not do military flight test have an M.D. or Ph.D., if not a master's, whereas Tanner's path to becoming an astronaut followed operational military flying and then into NASA for operational jet training before being selected into the NASA Astronaut Corps in 1992, following an unsuccessful application in 1987.
Answer: Buzz Aldrin