Also known as a unit crest or DUI, 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.
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 612th Engineer Battalion Distinctive Unit Insignia celebrates the lineage and history of the units that were organized to form the 3rd Battalion, 107th Armored Cavalry Regiment in May 1952.
An Arrowhead symbolizes the combat service of the Battalion during the assault landing at Luzon in the Philippines, with the wavy blue bar serving as an allusion to the award of the Presidential Unit Citation for that action. Two sunbursts in the upper half of the insignia refer to a pair of Philippine Presidential Unit Citations that were awarded to units in the Battalion’s lineage. The embattled bridge and archway are symbols of the Battalion’s construction capabilities; they also refer to the unit’s homes state of Ohio (“The Gateway State”). The scarlet used for the shield is the official branch color for Engineer units.
The combat service of the element of the battalion is symbolized by the arrowhead for the assault landing at Luzon, the wavy blue bar alluding to the award of the Presidential Unit Citation (ARMY) for that action, and two sunbursts referring to the awards of the two Philippine Presidential Unit Citations. The embattled bridge and archway symbolize the unit's building capabilities, and the security for Ohio, sometimes called the "gateway state." Scarlet is a color used by Engineer Units, and “Tried And Proven” is the unit motto.
During the War on Terrorism, the 612th Engineer Battalion as a whole was tapped for a Valorous Unit Award for its service in support of Operation Iraqi Freedom between 10 November 2004 and 23 December 2005. During that time and facing an armed enemy, the Battalion displayed extraordinary heroism while carrying out over 800 route-clearance missions, discovering nearly 240 Improvised Explosive Devices (IEDs) and thirty-three pieces of unexploded ordnance. In all, the Battalion destroyed over 90,000 pieces of unexploded ordnance and erected more than 28,000 barriers to increased force protection.
The 612th Engineer Battalion was inactivated in September 2006.