The 104th Regiment Distinctive Unit Insignia (also called a DUI or unit crest) was originally approved for the 387th Field Artillery in the Organized Reserves on 20 November 1936 and was redesignated for the 387th Field Artillery Battalion, Organized Reserved on 23 September 1942. A new design was approved for the unit on 10 September 1954, with an amendment to correct the wording in 1958. It was redesignated for the unit’s current designation on 18 August 1960.
Red and yellow, the only colors used in this insignia, are traditional Artillery colors, reflecting the unit’s previous designation in that branch. Three fleurs-de-lis stand for the unit’s three campaigns in Europe during World War II. FULMINIS
INSTAR, the unit motto, is Latin of “Like Lightning” and is a reference the unit’s Field Artillery service.
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. Full 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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For nearly the first forty years of it service life, the 104th Regiment was a until in the Artillery branch, originally constituted in the Organized Reserves as HQ and HQ Battery (HHB), 179th Field Artillery Brigade on 24 June 1921. In April 1942, it was reorganized and redesignated as 104th Division Artillery and ordered into active service the following September. It would take part in three campaigns in the European-African-Middle Eastern Theater before it was inactivated on 4 December 1945.
Activated in the Organized Reserves in March 1947, the unit was not deployed throughout the 1950s. On 10 June 1959, it was reorganized and redesignated as Headquarters and Headquarters Company, 104th Regiment, an element of the 104th Division (Training), and since that time has been comprised of Battalions—all elements of what is now designated as the 104th Training Division—that train both Enlisted Soldiers and Commissioned and Noncommissioned Officers in a variety of Military Occupational Specialties. Though reorganized under the U.S. Army Regimental System in 2008, the only other changes the unit has experienced is the number and numerical designation of the battalions assigned to it.