Constituted 19 October 1920 as the 45th Division.
Organized 3 August 1923 with headquarters at Oklahoma City, Oklahoma.
Ordered into federal service 16 September 1940 at Oklahoma City, Oklahoma.
Reorganized and redesignated 23 February 1942 as the 45th Infantry Division.
Inactivated 7 December 1945 at Camp Bowie, Texas.
Activated 5 September 1946 with headquarters at Oklahoma City, Oklahoma.
COMMANDERS IN COMBAT
Major General Troy H. Middleton - Assumed command October 1942
Major General William W. Eagles - Assumed command December 1943
Major General Robert T. Frederick - Assumed command December 1944
ORDER OF BATTLE
Headquarters, 45th Infantry Division
Headquarters Company 45th Infantry Division
45th Cavalry Reconnaissance Troop
120th Engineer Combat Battalion
157th Infantry Regiment
179th Infantry Regiment
180th Infantry Regiment
Headquarters and Headquarters Battery, Division Artillery
158th Field Artillery Battalion
160th Field Artillery Battalion
178th Field Artillery Battalion
189th Field Artillery Battalion
Headquarters, Special Troops
120th Medical Battalion
700th Ordnance Light Maintenance Company
45th Signal Company
45th Quartermaster Company
WORLD WAR II CAMPAIGN PARTICIPATION
Sicily (with arrowhead), Naples-Foggia (with arrowhead), Anzio, Rome-Arno, Southern France (with arrowhead), Rhineland, Ardennes-Alsace, Central Europe