Who was the fourth person to walk on the moon?

Alan LaVern Bean (March 15, 1932 – May 26, 2018) was an American naval officer and aviator, aeronautical engineer, test pilot, and National Aeronautics and Space Administration (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.

Bean was the Apollo Lunar Module pilot on Apollo 12, the second lunar landing. In November 1969, Bean and Pete Conrad landed on the Moon's Ocean of Storms after a flight of 250,000 miles and a launch that included a harrowing lightning strike.

He was the astronaut who executed John Aaron's "Flight, try SCE (Signal Conditioning Equipment) Aux (Auxiliary)" instruction to restore telemetry after the spacecraft was struck by lightning 36 seconds after launch, thus salvaging the mission. They explored the lunar surface, deployed several lunar surface experiments, and installed the first nuclear power generator station on the Moon to provide the power source.

Bean retired from the Navy in October 1975 as a captain, and continued as head of the Astronaut Candidate Operations and Training Group within the Astronaut Office in a civilian capacity.

Bean died on May 26, 2018, in Houston, Texas, at the age of 86. His death followed the sudden onset of an illness two weeks before.

Bean was interred in Arlington National Cemetery on November 8, 2018 with a service which included a flyover, military band, carriage procession, and gun salute.