The American Legion, commonly known as the Legion, is a nonprofit organization of U.S. war veterans headquartered in Indianapolis, Indiana. It is made up of state, U.S. territory, and overseas departments, and these are in turn made up of local posts. The organization was formed on March 15, 1919, in Paris, France, by a thousand officers and men of the American Expeditionary Forces (A. E. F.), and it was chartered on September 16, 1919, by the United States Congress.