A sky blue pentagon containing a black Roman numeral one (I) which is 1 3/8 inches (3.49 cm) in height and is centered with the base of the figure I parallel to the base of the pentagon; all within a 1/16 inch (.16 cm) inner white border and a 1/8 inch (.32 cm) outer red border.
The design contains our national colors of red, white and blue with the representation of the unit's numeric designation by the Roman numeral one.
The shoulder sleeve insignia was approved on 28 March 1944. (TIOH Dwg. No. A-1-154)