Description
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.

Symbolism
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.

Background
The shoulder sleeve insignia was approved on 7 Jul 1944. (TIOH Drawing Number A-1-364)