At Roosevelt’s request, Congress voted on 12 August 1941, to extend the Selective Training and Service Act of 1940 beyond 12 mos. It passed by one vote.
The first draft class of October 1940 threatened to desert and spray painted “OHIO” (Over the Hill In October) across their barracks, but few did. The extension affected about 70,000 draftees by the time of Pearl Harbor. The vast majority of these men would form the NCO corps of the US Army in 1942. The US Army would most likely not have been able to conduct effective offensive operations in 1942 without the extension.