Authorised 9 February 1924
A gold color metal and enamel device 1 1/2 inches (3.81 cm) in height consisting of the shield and motto of the coat of arms.
The beaver is the old symbol of New York dating from 1623, when it was on the arms of New Netherlands, and is now on the seal of New York City. The palm branch is symbolic of tropical service. The shield is red bordered with white, the Engineer colors, the border being indented in allusion to the Engineer work in connection with field intrenching.
The distinctive unit insignia was originally approved for the 3rd Engineer Regiment on 9 February 1924. It was redesignated for the 3rd Engineer Battalion on 11 March 1942. The insignia was redesignated for the 3rd Engineer Combat Battalion on 31 January 1950. It was redesignated for the 3rd Engineer Battalion on 30 October 1958. Coat of Arms