 In 1941, construction began on the Arkansas Ordnance Plant (AOP), which served as the primary facility for the development of fuses and detonators for World War II.Following the war, AOP ceased operations and the land was sold for commercial interests, including the development of the Little Rock Air Force Base in 1955.Today, portions of AOP still remain, including the Arkansas Ordnance Plant Guard House, which is on the National Register of Historic Places and the Jacksonville Museum of Military History.