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 (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.
Enlisted personnel wear the insignia centered on a shoulder loop by placing it an equal distance from the outside shoulder seam to the outside edge of the shoulder-loop button. Officers (except Generals) wearing grade insignia on the shoulder loops center the DUI by placing it an equal distance between the inside edge of the grade insignia and the outside edge of the button.
More guidance on wear of the DUI is found in DA Pamphlet 670-1, Section 21-22, "Distinctive unit insignia" and 21–3(d) and (e), "Beret" and "Garrison Cap," respectively.
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Made obsolete by the deactivation of the 311th Brigade Support Battalion in December 2018, the 311th Support Battalion Distinctive Unit Insignia was approved on 3 October 2007. Its simple yet powerful design features a red shield with two vertical silver-gray stripes (pales) surmounted by an isosceles triangle with counterchanged colors (the silver-gray stripes are red on the triangle and vice-versa for the red shield background). Red represents strength and might, while silver-gray is an allusion to the metal pewter, a metallic alloy comprising multiple metals that is symbolic of the multiple units that made up the Battalion.
A triangle is an emblem of strength and denotes stability, the ultimate mission of the Battalion. The two pales represent military strength, and when combined with the triangle they present a visual illustration of “311,” the unit’s numerical designation. The unit motto, VELOX SUSCIPIO, is in Latin. It translates into English as "Fast Support With Purpose And Direction."