A silver color metal and enamel device 1 1/8 inches (2.86cm) in height consisting of two silver antlers arched, surmounted by two blue bayonets saltirewise, overall a red fleur-de-lis palewise, the device enveloped by a circular black scroll, terminating at the bayonets, the scroll inscribed "MINUTEMAN ENGINEERS" in silver.
The antlers allude to service in the Ardennes campaign. The bayonets refer to the unit's history as Infantry from 1922 to 1959. The fleur-de-lis represents service in France, and the black scroll symbolizes the Rhineland.
The distinctive unit insignia was originally approved for the 181st Engineer Battalion on 17 Mar 1966. It was rescinded (cancelled) on 2 Jul 1975. On 26 Sep 1996 the insignia was reinstated for the 181st Engineer Battalion.