The following was written by Jean Nudd, Archivist at the U.S. National Archives and Records Administration Northeast Region in Pittsfield, Massachusetts. Because it was written by a government employee in conjunction with her employment, you may freely copy this and republish as you wish. However, I strongly suggest that you credit Jean Nudd as the author.
On May 18, 1917, Congress passed the Selective Service Act authorizing the President to draft men into military service. The Selective Service System (SSS), under the office of the Provost Marshal General (PMGO), was responsible for the process of selecting men for induction into the military service, from the initial registration to the actual delivery of men to military training camps.