A device of gold color metal and enamel 1 1/4 inches (3.18 cm) in width consisting of a red tower charged with a gold pheon, point up, between two red and blue taeguks on a white background, all above a blue motto scroll inscribed with the words ABILITY IN RESERVE in gold letters, all enclosed at top by a red bamboo stalk forming an arch and connecting with the scroll on either side.
Scarlet and white are the colors used for Engineers. The tower refers to the mission of the Corps of Engineers and also refers to the units service in World War II. The assault landings in the Pacific Islands are noted by the pheon. The combination of red, white and blue refers to the Philippine Presidential Unit Citation awarded the unit in World War II. The two taeguks symbolize the units many campaign credits during the Korean War and allude specifically to the two Republic of Korea Presidential Unit Citations awarded the unit during that service. The bamboo refers to the units service in Vietnam and is red, alluding to the Meritorious Unit Commendations awarded; one for Vietnam and one for Korea.
The distinctive unit insignia was approved on 28 May 1981.
NOTE: This Battalion was not authorized a coat of arms.