Fred Wallace Haise Jr. (born November 14, 1933) is an American former NASA astronaut, engineer, fighter pilot with the U.S. Marine Corps and U.S. Air Force, and a test pilot. He is one of only 24 people to have flown to the Moon, having flown as a Lunar Module Pilot on Apollo 13. He was to have been the sixth person to walk on the Moon, but the Apollo 13 landing mission was aborted en route.
An astronaut (or cosmonaut) is a person trained by a human spaceflight program to command, pilot, or serve as a crew member of a spacecraft.
Although generally reserved for professional space travelers, the terms are sometimes applied to anyone who travels into space, including scientists, politicians, journalists, and tourists.