Originally organized as the 4th Field Artillery in 1907 from both new and existing units and headquartered at Vancouver Barracks in Washington, the 4th Field Artillery Regiment took part in the Mexican Expedition but was not deployed to Europe during World War I. Before U.S. entry into World War II, the unit was designated a Battalion and earned a World War II campaign streamer (without inscription) before being inactivated again in December 1946.
During the Vietnam War, the Regiment was credited with participation in a dozen of the conflict's 17 campaigns, earning a Meritorious Unit Commendation, Presidential Unit Citation, and a Valorous Unit Award during that conflict (the Regiment shares lineage and honors with the 4th Air Defense Artillery Regiment during the period 1958 to 1971).
The 4th Field Artillery Regimental Distinctive Insignia (unit crest) was approved first approved for the 4th Field Artillery and was redesignated for the 4th Field Artillery Battalion in 1941. It was canceled effective 21 April 1959, but was reinstated and redesignated for the Regiment’s current title in September1871. The kris and krampilan are weapons used by enemies of the regiment in the Philippines; the Aztec sun recalls the Regiment’s times s with the Punitive Expedition in Mexico.
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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.
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.