Constituted 14 August 1917 as the 42nd Division.
Organized 5 September 1917 at Camp Mills, New York.
Inactivated 9 May 1919 at Camp Dix, New Jersey.
Redesignated 5 February 1943 as the 42nd Infantry Division.
Activated 14 July 1943 at Camp Gruber, Oklahoma.
Inactivated 29 June 1946 in Austria.
Activated 31 March 1947 with headquarters at New York, New York.
Major General Harry A. Collins - Assumed command July 1943
Headquarters, 42nd Infantry Division
Headquarters Company, 42nd Infantry Division
42nd Cavalry Reconnaissance Troop
142nd Engineer Combat Battalion
222nd Infantry Regiment
232nd Infantry Regiment
242nd Infantry Regiment
Headquarters and Headquarters Battery, Division Artillery
232nd Field Artillery Battalion
292nd Field Artillery Battalion
402nd Field Artillery Battalion
542nd Field Artillery Battalion
Headquarters, Special Troops
122nd Medical Battalion
742nd Ordnance Light Maintenance Company
132nd Signal Company
42nd Quartermaster Company
Rhineland, Ardennes-Alsace, Central Europe