The 45th Fires Brigade is a modular field artillery brigade of the United States Army headquartered in Mustang, Oklahoma. It is a part of the Oklahoma Army National Guard. Formed from elements of the disbanded 45th Infantry Division which saw action during World War II and the Korean War, along with the 45th Infantry Brigade Combat Team and 90th Troop Command, the 45th Fires Brigade was activated in 1968 as the 45th Field Artillery Group, later redesignated the 45th Field Artillery Brigade. The unit was again redesignated 45th Fires Brigade in 2008 with the implementation of Army Transformation.