Constituted 5 August 1917 as the 86th Division.
Organized 25 August 1917 at Camp Grant, Illinois.
Inactivated in January 1919 at Camp Grant, Illinois.
Activated 10 September 1921 with headquarters at Chicago, Illinois.
Ordered into active military service 15 December 1942 and reorganized at Camp Howze, Texas as the 86th Infantry Division.
Inactivated 30 December 1946 in the Philippine Islands.
Major General Harris M. Melasky - Assumed command January 1943
Headquarters, 86th Infantry Division
Headquarters Company, 86th Infantry Division
86th Cavalry Reconnaissance Troop
311th Engineer Combat Battalion
341st Infantry Regiment
342nd Infantry Regiment
343rd Infantry Regiment
Headquarters and Headquarters Battery, Division Artillery
331st Field Artillery Battalion
332nd Field Artillery Battalion
404th Field Artillery Battalion
911th Field Artillery Battalion
Headquarters, Special Troops
311th Medical Battalion
786th Ordnance Light Maintenance Company
86th Signal Company
86th Quartermaster Company
Central Europe