The Apollo 11 Command Module Columbia was the living quarters and overall spacecraft control center for the three-man crew during most of the first manned lunar landing mission in July 1969. On July 16, 1969, Neil Armstrong, Buzz Aldrin and Michael Collins climbed into Columbia for their 8-day journey. The Command Module was one of three parts of the complete Apollo spacecraft. The other two were the Service Module and the Lunar Module. The Service Module contained the main spacecraft propulsion system and consumables (oxygen, water, propellants, and hydrogen). The Lunar Module was the part Armstrong and Aldrin would use to descend to the moon's surface. Columbia is the only portion of this historic spacecraft that returned to earth.