Ronald Evans (astronaut) 19 astronauts selected by NASA in April 1966. He served as a member of the astronaut support crews for the Apollo 7 and Apollo 11 flights, and as backup Command Module Pilot for Apollo 14. Evans' only space flight was as Command Module Pilot of Apollo 17, the last scheduled U.S. manned mission to the Moon. He was accompanied by Eugene Cernan and Harrison Schmitt. While Cernan and Schmitt landed and worked on the Moon in the Taurus–Littrow valley, Evans remained in lunar orbit on board the Command Module "America", completing assigned work tasks which required visual geological observations, hand-held
John Young (astronaut) Module, the Apollo Lunar Module, and the Space Shuttle. In 1965, Young flew on the first manned Gemini mission, and commanded another Gemini mission the next year. In 1969 during Apollo 10, he became the first person to fly solo around the Moon. He drove the Lunar Roving Vehicle on the Moon's surface during Apollo 16, and is one of only three people to have flown to the Moon twice. He also commanded two Space Shuttle flights, including its first launch in 1981, and served as Chief of the Astronaut Office from 1974 to 1987. Young retired from NASA in