The 700th Brigade Support Battalion is headquartered in Norman, Oklahoma. It is a part of the 45th Infantry Brigade Combat Team, Oklahoma Army National Guard. The 700th BSB is the element of the 45th IBCT with the most combat experience, predating the division. Smaller elements that would become the 700th BSB saw action during World War I. The battalion, originally the 120th Medical Regiment, formed in 1923, served in World War II and the Korean War as part of the 45th Infantry Division, then again, in its current designation as 700th Support Battalion, in Afghanistan and Iraq as part of the 45th Infantry Brigade.