The Distinctive Unit Insignia of the Fort Riley Dental Activity (DENTAC), commonly referred to as a unit crest or a DUI, takes the three principle functions of modern dentistry—prevent dental disease, maintain dental health, and perform restorative procedures to counteract damaged teeth or gums or reduced dental functions—and symbolizes them with a triangle featuring a maroon background (an Army Medical Department color) containing an adaptation of a caduceus (without wings and made with a sword instead of the traditional staff). The triangle is also the Greek letter “Delta”—the first letter in Dentistry.
Gold and silver are appropriate colors to complement the maroon triangle—they are the two precious metals used in dental work. At the top of the insignia is a demi-sun, an emblem of leadership that also is an allusion to a sunflower, the state flower of the unit’s home in Kansas.
The Fort Riley DENTAC unit crest was approved on 15 May 1980 but was cancelled with an effective date of 30 September 2016 to reflect the unit’s discontinuation and replacement by the
Fort Riley Dental Health Activity Distinctive Unit Insignia.
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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."