The organization ultimately experienced both success and failure. The Army Amateur Radio System succeeded in developing the proficiency of its radio operators as demonstrated by the support provided to local, state, and federal authorities during natural disaster relief efforts. However, on the eve of the United States' entry into World War II, the Army Amateur Radio System's membership was significantly underdeveloped in numbers to provide significant manpower to augment the Signal Corps' mobilization for war. The AARS organization continued to operate until the United States entry into World War II on 7 December 1941, at which time radio amateurs were denied the use of the airwaves, and the amateur service and the Army Amateur Radio System were deactivated. Following WWII, the US Army recognized the importance of reactivating the AARS to train vitally needed communications personnel at a relatively low direct cost to the government, and in 1946 the AARS was reactivated.