The various units that wound up as components of the 45th Field Artillery Brigade can all trace their origins to Enid, Oklahoma and the Oklahoma National Guard. This shared heritage is reflected in the Indian head found in the center of the 45th Field Artillery Brigade Distinctive Unit Insignia, or unit crest. Superimposed on a scarlet, diamond-shaped background, the profile is encircled by the unit motto, “Pride Valor Excellence,” inscribed in scarlet letters on a gold/yellow background, incorporating the colors closely associated with the Field Artillery branch for over 200 years.
The 45th Field Artillery Brigade unit crest was first approved for wear on 17 May 1972 for members of the 45th Field Artillery Group. It was redesignated for the 45th Field Artillery Brigade on 12 December 1978, and again on 1 September 2008 when the unit was redesignated as a Fires Brigade. It is unclear when the Brigade reverted to Field Artillery, but the insignia was redesignated for it at that time.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. 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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As of Autumn 2023, the 45th Field Artillery Brigade is an active unit in the Oklahoma Army National Guard headquartered in Mustang, Oklahoma. Its mission is to support Corps- or Division-level by providing long-range artillery and coordinating joint fires capabilities. In addition to its HQ and HQ Battery, it consists of a Field Artillery Battalion, a Forward Support Company, a Brigade Support Company, and a Network Signal Company.