Neil Armstrong was an American astronaut, aerospace engineer, and the first person to walk on the Moon. He was born on August 5, 1930, in Wapakoneta, Ohio. Armstrong joined NASA in 1962 as part of the astronaut program and became a part of the Apollo 11 mission, which was the first successful mission to land humans on the Moon on July 20, 1969. He famously stepped onto the lunar surface with the words, "That's one small step for [a] man, one giant leap for mankind." Before becoming an astronaut, Armstrong served as a naval aviator and test pilot. He retired from NASA in 1971, later teaching aerospace engineering at the University of Cincinnati. Armstrong passed away on August 25, 2012, leaving a legacy as a symbol of human achievement and exploration.