A pentagon whose points lie on an imaginary circle 2 1/8 inches (5.40 cm) in diameter whose edges are white lines 3/16 inch (.48 cm) in width and whose radial lines are white 1/8 inch (.32 cm) in width. The triangles thus outlined in white are flag blue.
The pentagon represents the number of the Corps, while blue and white are the colors associated with Corps flags.
The shoulder sleeve insignia was approved on 3 December 1918. (TIOH Drawing Number A-1-61)