100th Regiment

Constituted 23 July 1918 in the National Army as Headquarters, 175th Field Artillery Brigade, and assigned to the 100th Division
Demobilized 30 November 1918
Reconstituted 24 June 1921 in the Organized Reserves as Headquarters and Headquarters Battery, 175th Field Artillery Brigade, and assigned to the 100th Division
Organized in December 1921 at Parkersburg, West Virginia
Reorganized and redesignated 23 February 1942 as Headquarters and Headquarters Battery, 100th Division Artillery
Ordered into active military service 15 November 1942 and reorganized at Fort Jackson, South Carolina
Inactivated 10 January 1946 at Camp Patrick Henry, Virginia
Redesignated 15 October 1946 as Headquarters and Headquarters Battery, 100th Airborne Division Artillery
Headquarters activated 23 October 1946 at Louisville, Kentucky; Headquarters Battery activated 20 December 1946 at Louisville
(Organized Reserves redesignated 25 March 1948 as the Organized Reserve Corps; redesignated 9 July 1952 as the Army Reserve)
Reorganized and redesignated 12 May 1952 as Headquarters and Headquarters Battery, 100th Division Artillery
Reorganized and redesignated 17 April 1959 as Headquarters and Headquarters Company, 100th Regiment, an element of the 100th Division (Training) (organic elements concurrently organized as new units)
Regiment ordered into active military service 25 September 1961 at Louisville, Kentucky; released from active military service 15 August 1962 and reverted to reserve status
Reorganized 26 January 1968 to consist of the 1st and 2d Battalions, elements of the 100th Division (Training)
Reorganized 5 July 1971 to consist of the 1st, 2d, and 3d Battalions, elements of the 100th Division (Training)
1st, 2d, and 3d Battalions inactivated 1 August 1973 and relieved from assignment to the 100th Division (Training)
Regiment reorganized 16 November 1996 to consist of the 1st, 2d, 3d, 4th, 5th, 6th, 7th, 8th, 9th, and 10th Battalions, elements of the 100th Division (Institutional Training)
Reorganized 17 October 2005 to consist of the 1st, 2d, 3d, 4th, 5th, 6th, 7th, 8th, 9th, 10th, 11th, 12th, and 13th Battalions, elements of the 100th Division (Institutional Training)
Elements ordered into active military service for the War on Terrorism
(9th and 10th Battalions relieved 1 October 2006 from assignment to the 100th Division [Institutional Training])
Reorganized 15 July-15 August 2008 to consist of the 1st, 2d, 3d, 4th, 5th, 6th, 7th, 8th, 11th, 12th, and 13th Battalions, elements of the 100th Division (Institutional Training)
(1st, 2d, 4th, 5th, 6th, 7th, and 13th Battalions relieved 1 October 2008 from assignment to the 100th Division [Institutional Training])
Reorganized 16 September 2009 to consist of the 1st, 2d, and 4th Battalions, elements of the 102d Training Division; the 3d, 8th, 11th, and 12th Battalions, elements of the 100th Training Division; and the 5th, 6th, 7th, and 13th Battalions, elements of the 94th Training Division

CAMPAIGN PARTICIPATION CREDIT

World War II
Rhineland
Ardennes-Alsace
Central Europe

DECORATIONS

None

BY ORDER OF THE SECRETARY OF THE ARMY:

ROBERT J. DALESSANDRO
Director, Center of Military History