On a shield 2 3/8 inches (6.03 cm) in height and 2 inches (5.08 cm) in width divided vertically red and blue, bordered yellow, a vertical yellow lightning flash between two yellow stylized figure nines, one reversed, with stems joined.
Scarlet, blue and yellow are the colors of the various groups that make up a Combat Team. The lightning flash represents the effective teamwork of the organization. The abstraction of two parts of a grenade, the safety pin pull ring and the safety lever, symbolizes the mission of a Combat Team to arm and strike. They also simulate the two nines in the designation Ninety-ninth Battalion Combat Team.
The shoulder sleeve insignia was approved on 9 October 1956. It was cancelled on 1 July 1958. (TIOH Dwg. No. A-1-242)