The I Corps' Unit Crest, officially called a Distinctive Unit Insignia (DUI) is replete with symbols of the unit's combat history—a far cry from the simple design used for its Shoulder Sleeve Insignia/Combat Service ID Badge (see links below). An erupting volcano represents the Corps' World War II battles in Australia, the Philippines, New Guinea, and Japan and its subsequent service in Korea, all located in the volcanic "Ring of Fire” in the Pacific.
Besides being a direct reference the unit’s numerical designation, the Roman numeral "I" highlights the fact that it was the first Army Corps to see combat in two World Wars. The blue of the mountain is both the color of Infantry and an allusion to the Pacific Ocean where it spent so much time in action, while the gold of the insignia denotes the high worth of the unit and its contributions to victory. "America's Corps," the unit's nickname, is a reference to the large percentage of its units that are drawn from the Army Reserve and the geographical diversity of their locations throughout the United States.
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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.Related Items
I Corps Unit Patch (SSI)
I Corps Combat Service ID Badge (CSIB)