Also known as a unit crest or DUI, a Distinctive Unit Insignia is worn by all Soldiers (except General Officers) in units that have been authorized to be issued the device. It is worn centered on the shoulder loops of the Army Green Service Uniform (AGSU) and the blue Army Service Uniform (ASU, Enlisted only) with the base of the insignia toward the outside shoulder seam. DUIs are not worn on the Dress variations of either uniform, however.
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The 115th Engineer Battalion Distinctive Unit Insignia was approved on 24 October 1956. In its center are three wavy partition lines that simulate water. Three points above it refer to the three Asiatic-Pacific campaigns—Bismarck Archipelago, Southern Philippines, and Luzon—that the 1334th Engineer Battalion, the unit’s immediate predecessor, took part in during World War II. The organization is authorized to display an Arrowhead device on the Luzon campaign streamer to indicate it took a planned, authorized part in an assault landing of that battle.
Above the peaks is a mortar shell, a symbol that is a reference to fulfilling Engineer mission requirements while under direct enemy attack. Scarlet, white, and blue used in the insignia are the colors found in the Philippine Presidential Unit Citation awarded to the unit for service in the liberation of the Philippines. GARDE LA PAIX, the unit motto, is French for “Guard The Peace.”