Description
On a yellow shield, 3 inches (7.62 cm) in height and 2 inches (5.08 cm) in width overall, arched at the top and bottom, on a bend wavy green a white lightning bolt all within a 1/8 inch (.32 cm) green border.

Symbolism
The wavy bend refers to the Mississippi River. The lightning bolt symbolizes the striking power and shock action of the unit. Yellow and green are colors used for armored units.

Background
The shoulder sleeve insignia was originally approved for the 155th Armored Brigade on 21 February 1974. It was redesignated for the 155th Armored Brigade Combat Team with the description and symbolism updated on 25 July 2007. (TIOH Drawing Number A-1-572)