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The Casper Army Air Base is one of only four World War II military installations constructed in Wyoming (the other three installations were the Prisoner of War Camp at Douglas, the Heart Mountain Relocation Center between Cody and Powell, and the quartermaster facility at Fort F.E. Warren in Cheyenne). The Base was activated on September 1, 1942. Over four hundred buildings were built during a three and one-half month construction period. It was occupied by the 211th Army Air Force Base Unit consisting of twenty-one officers and 165 enlisted men, whose mission was to operate the base and train bomb groups for overseas assignment and individual replacement bombardment combat crews. During its thirty months of active life, the Base trained an estimated 16,000 combat crew members. The Base was officially deactivated on March 7, 1945 and personnel were transferred to other bases. In 1949, the former military air field became the Natrona County Municipal Airport and the land and all buildings became county property. Approximately one hundred of the original buildings that constituted the Casper Army Air Base, along with the original street layout, parade grounds, and concrete pads for many of the former buildings, remain.