The Distinctive Unit Insignia (also called a DUI or unit crest) for the U.S. Army Dental Activity, Fort Lewis was approved on 26 September 1980. With the unit slated to be discontinued on 30 September 2016, the insignia was also cancelled at the same time.
Maroon and white (or silver), the colors traditionally associated with Dental Corps units, are used for the text and scroll that almost completely encircles the insignia, as well as for the cross and silver triangle in the center of the device. The triangle is a symbol for the Greek letter “delta,” which here recalls “Dental” as a reference to the Dental Corps; with the cross in the center of the triangle creates a visual that means “Dental Care.”
The snow-capped mountain is an allusion to the Cascade and Olympic mountain ranges that surround the area of Puget Sound in Washington. Besides referring to the “Evergreen State,” the green-tinted mountain slopes evoke thoughts of life, growth, and health. “With Great Compassion” is the organizational motto.
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The 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."