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.
Full 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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The 519th Combat Support Battalion Distinctive Unit Insignia was originally approved on 24 July 1963 for the 38th Supply and Transport Battalion, but the coat of arms from which it is taken was approved for the 538th Transportation Battalion on 29 November 1962. The DUI was redesignated for the 38th Support Battalion (with revised symbolism) on 20 November 1992, and finally the 519th Support Battalion on 1 September 2008. The 519th Support Battalion has been redesignated as the 519th Combat Sustainment Support Battalion since that time and is assigned to the 38th Sustainment Brigade of the Indiana Army National Guard. As of Summer 2023, its Headquarters and Headquarters Company are stationed at Terre Haute, Indiana.
Brick red and yellow (gold) used in the insignia are the branch colors of the Transportation Corps. The tread track and tire track represent the different types of mobility that was employed by the Battalion, and the wing is a symbol of swift transportation. PRÊT DISPOSÉ CAPABLE, the Battalion motto, is Latin for “Ready Willing Able.”