The Selective Training and Service Act of 1940 was passed by Congress on 16 September 1940, establishing the first peacetime conscription in United States history. It required all men between the ages of 18 to 64 to register with Selective Service. It originally conscripted all men aged 21 to 35 for a service period of 12 months. In 1941 the military service period was extended to 18 months; later that year the age bracket was increased to include men aged 18 to 37. Following the Japanese air raid attack on Pearl Harbor on Sunday, 7 December 1941, and the subsequent declarations of war by the United States against the Empire of Japan and a few days later against Nazi Germany, the service period was subsequently extended in early 1942 to last for the duration of the war, plus a six-month service in the Organized Reserves.