On a red acorn 1 5/8 inches (4.13cm) across, 1 3/4 inches (4.45cm) in length standing in its cup 2 1/8 inches (5.40cm) across and 1 inch (2.54cm) in length a white letter "A" 1 1/8 inches (2.86cm) in width and 2 inches (5.08cm) in height.
The acorn is a symbol of strength and the letter "A" is the initial letter of its organization. The colors are those of the Army distinguishing flag.
The shoulder sleeve insignia was approved on 7 Jul 1944. (TIOH Drawing Number A-1-364)