The division's two combat commands, the 89th and 90th Infantry Brigades, were not activated, as the army favored smaller and more versatile regimental commands for the new conflict. The 45th Infantry Division was instead based around the 157th, 179th, and 180th Infantry Regiments. Also assigned to the division were the 158th, 160th, 171st, and 189th Field Artillery Battalions, the 45th Signal Company, the 700th Ordnance Company, the 45th Quartermaster Company, the 45th Reconnaissance Troop, the 120th Engineer Combat Battalion, and the 120th Medical Battalion.