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 124th Maintenance Battalion Distinctive Unit Insignia was approved on 2 October 1970. Its crimson and light blue tones are the colors used in heraldry for Maintenance units.
In its center is an upright sword placed between two wrenches. The sword is a symbol for military weaponry in general and thus denotes a complete arsenal of military weaponry and the components associated with them; combined with the two wrenches, it symbolizes the basic mission of the battalion. “Support With Distinction” is the organization’s motto.
It is not clear whether this Battalion is still active. Older articles on the Internet indicate that it was an Amy Reserve unit stationed at Fort McCoy in Wisconsin. It was one of just two of the Army Reserve's five Maintenance Battalions at the time to implement a Maintenance Training program called Operation Platinum Wrench, a two- to four-month program introduced in 1997 at Fort McCoy that integrated the operations of direct support, general support, and service Companies under a single training program.