What does DUI stand for?

Distinctive Unit Insignia (US Army)

This definition appears very rarely and is found in the following Acronym Finder categories:

Military and Government

Other Resources:

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Samples in periodicals archive:

Other uniform changes include authorization for all personnel to wear a combat-service identification badge and for enlisted personnel to wear distinctive unit insignia on the shoulder loops of the blue coat.

Army Moves Toward Blue Service Uniform

Distinctive unit insignia (an enameled metal pin worn by soldiers), coats of arms (on a flag), and shoulder sleeve insignia (patch) for an organization can share a color scheme and some design elements, but cannot be identical.

The design of American heraldry: an interview with Charles V. Mugno

Enlisted soldiers wear their distinctive unit insignia centered on the flash.

Beret wear & army service uniform

The distinctive unit insignia for the 743d MI Battalion is a silver-color metal and enamel device consisting of a medium blue oval gridlined silver delta flight symbol, enclosed in base by a black scroll inscribed with the unit motto in silver; overall, a diagonally crossed black dagger and yellow lightning flash.

743d Military intelligence Battalion. (Beyond All Boundaries)