During World War II, the military built Sedalia Glider Base in Johnson County to the west. After the war, this facility was transferred to the Strategic Air Command. It was converted to a bomber base, the Whiteman Air Force Base, named after 2nd Lt. George A. Whiteman, an Army Air Corps pilot who was killed during the 1941 Japanese attack on Pearl Harbor. After a massive construction program, the base became the center of 150 ICBM silos and administrative offices. These were decommissioned in the 1990s.