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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A scarlet chevron at the base of the shield on the 231st Support Battalion Distinctive Unit Insignia has a dual meaning: while a chevron typically denotes support and scarlet is a color traditionally used by Support units, the color here also stands for valor and sacrifice. The castle, longtime symbol of strength and defense, alludes to the unit’s ties to the Corps of Engineers, but a glance over the rest of the insignia reveals ties to other branches of the Army. The Quartermaster Corps is referenced by the blue color and the key; the Maintenance branch is referenced by a wrench; the Ordnance Corps is alluded to with the flaming bomb; and the Transportation Corps is evoked with the demi-wheel inside the chevron.
A golden sunburst, on the other hand, is adapted from the insignia of the 41st Division and commemorates the Battalion’s heritage. “Warriors Support Warriors” is the Battalion motto.
Approved for the 231st Support Battalion on 1 September 2008, this insignia would also be worn by the 231st Brigade Support Battalion, North Dakota Army National Guard until its inactivation in August 20