Astronaut Al Worden
Al Worden was one of the 19 astronauts selected by NASA in April 1966.He served as a member of the astronaut support crew for the Apollo 9 flight and as backup Command Module Pilot for the Apollo 12 flight.
Worden has been listed in the Guinness Book of World Records as the "Most isolated human being" during his time alone in the command module Endeavour. When the orbiting command module was at its greatest distance from Scott and Irwin in the Falcon, Worden was 2,235 miles (3,597 km) away from any other human beings. Worden said he enjoyed his "three wonderful days in a spacecraft all by myself", including not communicating with Earth while on the far side of the Moon, because he was used to being alone as a fighter pilot.
Now I know why I'm here. Not for a closer look at the Moon, but to look back at our home, the Earth.
— About his feelings during Apollo 15.