A gold color metal and enamel device 1 1/8 inches (2.86cm) in height overall consisting of a gold pheon, point to base, surmounted by a white enameled escarbuncle having a torteau at its center and with its topmost spoke capped by a smaller gold pheon, point up, in front of a red tower with three merlons and all above and between a blue scroll, the ends curving inwards behind the upper two spokes ends and terminating at the sides of the tower inscribed "DEDICATED AND DILIGENT" in gold letters.
Scarlet and white are the colors used for the Corps of Engineers. The seven visible spokes of the escarbuncle together with the torteau or red disc, representing an artillery projectile, allude to the seven campaign credits earned in Europe as a Field Artillery organization, while an element of the 36th Infantry Division during World War II. The two pheons (arrowheads) refer to their two assault landings, with the reversed arrowhead, simulating the letter "V," alluding to Vosges and to the Croix de Guerre with palm awarded during that period. The tower, traditional symbol used by the Corps of Engineers, refers to the present basic mission of the 111th Engineer Battalion.
The distinctive unit insignia was approved on 11 Jun 1971.