Constituted 13 January 1941 as the 4th Armored Division.
Activated 15 April 1941 at Pine Camp, New York.
Converted and redesignated 1 May 1946 as the 1st Constabulary Brigade.
Inactivated 20 May 1949 in Germany and concurrently converted and redesignated as the 4th Armored Division.
Major General John S. Wood - Assumed command May 1942
Major General Hugh J. Gaffee - Assumed command December 1944
Major General William H. Hoge - Assumed command March 1945
Headquarters, 4th Armored Division
Headquarters Company, 4th Armored Division
25th Cavalry Reconnaissance Squadron
24th Armored Engineer Battalion
Headquarters and Headquarters Company, Combat Command A, 4th Armored Division
Headquarters and Headquarters Company, Combat Command B, 4th Armored Division
Headquarters, Reserve Command, 4th Armored Division
8th Tank Battalion
35th Tank Battalion
37th Tank Battalion
10th Armored Infantry Battalion
51st Armored Infantry Battalion
53rd Armored Infantry Battalion
Headquarters and Headquarters Battery, Division Artillery
22nd Armored Field Artillery Battalion
66th Armored Field Artillery Battalion
94th Armored Field Artillery Battalion
Headquarters and Headquarters Company, Division Trains
4th Armored Medical Battalion
126th Armored Ordnance Battalion
144th Armored Signal Company
Normandy, Northern France, Rhineland, Ardennes-Alsace, Central Europe