Constituted 18 July 1917 as the 34th Division.
Organized 25 August 1917 at Camp Cody, New Mexico.
Inactivated 18 February 1919 at Camp Grant, Illinois.
Activated 14 July 1924 with headquarters at Council Bluffs, Iowa.
Ordered into federal service 10 February 1941 at Council Bluffs, Iowa.
Reorganized and redesignated 1 February 1942 as the 34th Infantry Division.
Inactivated 3 November 1945 at Camp Patrick Henry, Virginia.
Activated 19 November 1946 at Des Moines, Iowa.
Major General Charles W. Ryder - Assumed command May 1942
Major General Charles L. Bolte - Assumed command July 1944
Headquarters, 34th Infantry Division
Headquarters Company, 34th Infantry Division
34th Cavalry Reconnaissance Troop
109th Engineer Combat Battalion
133rd Infantry Regiment
135th Infantry Regiment
168th Infantry Regiment
Headquarters and Headquarters Battery, Division Artillery
125th Field Artillery Battalion
151st Field Artillery Battalion
175th Field Artillery Battalion
185th Field Artillery Battalion
Headquarters, Special Troops
109th Medical Battalion
734th Ordnance Light Maintenance Company
34th Signal Company
34th Quartermaster Company
Tunisia, Naples-Foggia, Anzio, Rome-Arno, North Apennines, Po Valley