Harrison Schmitt cancelled in September 1970, the community of lunar geologists supporting Apollo felt so strongly about the need to land a professional geologist on the Moon, that they pressured NASA to reassign Schmitt to a remaining flight. As a result, Schmitt was assigned in August 1971 to fly on the last mission, Apollo 17, replacing Joe Engle as Lunar Module Pilot. Schmitt landed on the Moon with commander Gene Cernan in December 1972. Schmitt claims to have taken the photograph of the Earth known as "The Blue Marble", possibly one of the most widely distributed photographic images in existence. NASA officially
Pete Conrad Pete Conrad Charles "Pete" Conrad Jr. (June 2, 1930 – July 8, 1999), (Captain, USN), was an American NASA astronaut, aeronautical engineer, naval officer and aviator, test pilot, and during the Apollo 12 mission became the third man to walk on the Moon. Conrad was selected in NASA's second astronaut class. He set an eight-day space endurance record along with his Command Pilot Gordon Cooper on his first spaceflight, the Gemini 5 mission. Conrad also commanded the Gemini 11 mission. He became the third human to walk on the moon during the Apollo 12 mission. After Apollo, he commanded Skylab