The 125th Ordnance Battalion Distinctive Unit Insignia, also referred to as a “unit crest” or by the initials DUI, was approved in 1969. Its design was based upon a suggestion by two members of the unit—Specialist 4 Joseph E. Cross and Private First Class Donald Thomas. “Arno And Onward,” the motto of the Battalion, is a reference to the unit’s service in the campaign officially designated as Rome-Arno which began on 22 January 1944 and ended on 9 September 1944. A red fireball, representing Ordnance, is superimposed on a wheel to denote the unit’s role as an automotive maintenance unit in World War II. Encircling the cog wheel and fireball is an atomic icon, implying expertise in nuclear ordnance as well as in traditional explosive ordnance.
The entire insignia is enveloped in a wreath of laurel leaves, the ancient Greco-Roman symbol of honor in battle.
Aside from its status as a unit in the Montana Army National Guard, almost no information on the 125th Ordnance Battalion is available in locations readily accessible by the general public. It appears to have been inactivated, deactivated, redesignated, or disbanded at some point in the middle of the first decade of the 21st century.
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Distinctive Unit Insignias are 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.