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Alan Bean (1932–2018) was an American naval officer, naval aviator, aeronautical engineer, test pilot, and NASA astronaut. During the Apollo 12 mission, on 19–20 November 1969, he became the fourth person to walk on the Moon. This portrait photograph, taken by NASA two months before the mission, depicts Bean beside a mock-up of the Apollo Lunar Module, wearing his space suit without the helmet and gloves.Photograph credit: NASA / Johnson Space Center