The 304th Military Intelligence Battalion Distinctive Unit Insignia (DUI), known more commonly as a unit crest, was originally approved for the 304th Army Security Agency Battalion on 29 April 1976. It was redesignated for the 304th Military Intelligence Battalion on 2 May 1990. A taeguk inside a diamond simulates the appearance of an eye, with lightning flashes symbolizing technology; when combined they stand for the vigilance and swiftness of Army Security while also alluding to the service of the unit’s lineage in World War II and Korea.
A vine leaf below the diamond is a reference to the Rhine Province to indicate the unit’s participation in the Rhineland campaign, and the taeguk is a Korean symbol commemorating the unit’s participation in six campaigns in the Korean War as well as the Meritorious Unit Commendation it was awarded for that service. The black triangle connotes iron and is a reference to the Republic of Korea Presidential Unit Citation inscribed “THE IRON TRIANGLE” that the organization was awarded. “Honor Vigilance Duty” is the unit motto.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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Since 1990, the 304th Military Intelligence Battalion, 111th Military Intelligence Brigade has been assigned to the U.S. Army Training and Doctrine Command and has carried out training and instruction at Fort Huachuca, Arizona. It was originally constituted in the Army of the United States as the 590th Signal Depot Company on 15 April 1944. After taking part in the Rhineland campaign in Europe, the Company was inactivated on 4 December 1945.
After being redesignated on 17 March 1848 as the 848th Signal Radio Relay Company and allotted to the Organized Reserves (known as the Army Reserve after July 1952) and reactivated on 2 April 1948, it would be inactivated again in just seven months. 11 February 1949 saw the unit redesignated as the 848th Signal Service Company and activated on 10 March. 11 September 1950 marked the Company’s return to active military service (see above).
Korea was the last conflict for which the unit would deploY and was inactive for a twenty-year stretch that began in August 1955 and ended in April 1975. The unit finally received its current designation in 1990, and its outstanding service throughout that year and the next was later recognized with an Army Superior Unit Award, the first of two it would receive over the course of a decade. As of Autumn 2023, the Battalion continues to continues to train and educate the next generation of Military Intellitgence junior commissioned officers and warrant officers at its home at Fort Huachuca, Arizona.