In this July 20, 1969 file photo provided by NASA shows astronaut Edwin E. "Buzz" Aldrin Jr. posing for a photograph beside the U.S. flag deployed on the moon during the Apollo 11 mission. Aldrin and fellow astronaut Neil Armstrong were the first men to walk on the lunar surface. The trio was launched to the moon by a Saturn V launch vehicle at 9:32 a.m. EDT, July 16, 1969. They departed the moon July 21, 1969.

Photos: Apollo 11

On July 16, 1969, Apollo 11 lifted off on the mission that put men on the moon 4 days later.