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 13th Air Defense Artillery Group Distinctive Unit Insignia was originally approved for the 13th Coast Artillery Regiment on 11 August 1924 and redesignated for the 13th Artillery Group on 20 November 1967. The Latin motto QUOD HABEMUS DEFENDEMUS, which translates to “What We Hold We Will Defend,” was added to the insignia on 20 November 1967. On 4 April 1972 it was redesignated for the 13th Air Defense Artillery Group.
The color red used for the shield indicates the unit was a part of the Air Defense Artillery branch, and the gold trim on the saltire alludes to the organization of the unit in the South from the Coast Defenses of Charleston, Pensacola, Key West, and Galveton. The saltire is taken from the battle flag of the Confederacy, while the fleur-de-lis symbolizes the service in France of predecessor unit 121st Company, Coast Artillery Corps.