Twelfth Army Group shoulder sleeve insignia of the type issued during World War II. The design, approved July 29, 1944, resembles a downward pointing arrowhead implying force in the red, white, and blue national colors of the United States. This unit, consisting of American troops, was directly under the control of Supreme Headquarters, Allied Expeditionary Force, beginning September 1, 1944. It fought its way across Europe, encircling the German Army in the Ruhr Valley in April 1945. It was the largest force ever assembled by the US military. Germany surrendered May 7 and the Group was inactivated on July 31, 1945.