The 36th Infantry Division ("Arrowhead") also known as the "Panther Division", the "Lone Star Division", "The Texas Army", and the "T-patchers", is an infantry division of the U.S. Army and part of the Texas Army National Guard. The 36th Infantry Division was first organized during World War I (1914–1918) from units of the Texas and Oklahoma National Guards. After the war, the division was reformed as an all-Texas unit, and was called to service for World War II (1937–1945) on 25 November 1940, was deployed to the European Theater of Operations in April 1943, and returned to the Texas National Guard in December 1945.