Major General Ulysses Grant McAlexander (30 August 1864 – 18 September 1936) was an American officer who served in the United States Army. He was heavily decorated for valor, and is one of the iconic fighting men of the American Expeditionary Forces (AEF) during World War I. He is most famous for commanding the 38th Infantry Regiment during the Second Battle of the Marne in July 1918, and earning himself and the regiment the moniker, "Rock of the Marne" (later adopted by the entire 3rd Infantry Division).