The 18th Strategic Aerospace Division is an inactive United States Air Force unit. Its last assignment was with the Fifteenth Air Force, stationed at Fairchild Air Force Base, Washington. It was inactivated on 2 July 1968. The 18th Composite Wing served as part of the defense force for the Hawaiian Islands from 1 May 1931 – 29 January 1942. It inactivated after suffering disastrous losses in the Japanese attack on Pearl Harbor (7 December 1941). From June 1942 – April 1944, it operated as the 18th Replacement Wing, processing personnel entering Second Air Force.