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.
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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The 338th Finance Battalion Distinctive Unit Insignia was approved on 13 July 1995. Silver gray and golden yellow, branch colors of the Finance Corps, are found in the scroll and text of the unit motto “In Finance We Trust,” respectively; the black seen in the shield portion denotes solvency/ The red lozenge (diamond shape) is adapted from the Finance Corps’ branch insignia; it is colored red to recall the Meritorious Unit commendation the unit was awarded, with the blazing sun behind it recalling the unit’s service in Southwest Asia as well as the sunny climes of Puerto Rico.
Inside the lozenge is the “garita,” a lookout post or watchtower inspired by ones used at El Morro, a famous Spanish fort on Puerto Rico; this imagery identifies the unit’s affiliation with the 65th Army Reserve Command, which has the same image of the lookout post on its Shoulder Sleeve Insignia. The four quarters of the shield are intended to suggest teamwork, as well as the need for Finance Corps units to serve both day and night to ensure Soldiers’ pay and other financial services are delivered in timely fashion. "In Finance We Trust" is the Battalion motto.
Before its inactivation in the mid-2000s, the 338th Finance Battalion was stationed at Fort Buchanan, Puerto Rico.