A silhouetted right cylinder 3 inches (7.62 cm) in height and 2 inches (5.08 cm) in width. Within a 1/8 inch (.32 cm) blue border fimbriated by a 1/16 inch (.16 cm) white inner edge, on a blue field a white serrated vertical band 1 3/32 inches (2.78 cm) in width charged with a red cartridge 2 5/8 inches (6.67 cm) in height.
Blue and white are the colors used for Infantry. The serrated section is symbolic of close combat and counterattack abilities. The cartridge alludes to the unit's capabilities of destroying the enemy and repelling his assault with fire powers. Red, the most powerful color of the spectrum, represents the striking power of the unit.
The shoulder sleeve insignia was approved on 14 December 1962. It was amended to correct the description on 12 February 1963. (TIOH Drawing Number A-1-307)