The American Legion, commonly known as the Legion, is an organization of U.S. war veterans headquartered in Indianapolis, Indiana. It comprises state, U.S. territory, and overseas departments, in turn made up of local posts. It was established in March 1919 in Paris, France, by officers and men of the American Expeditionary Forces (A.E.F.). It was subsequently chartered by the 66th U.S. Congress on September 16, 1919.