Lineage and Honors Information as of 16 April 2014
21st ENGINEER BATTALION
- Organized 31 December 1861 in the Regular Army at Washington, D.C., from new and existing companies of engineers as a provisional engineer battalion (constituted 28 July 1866 as the Battalion of Engineers)
- Expanded 14 March-7 June 1901 to form the 1st and 2d Battalions of Engineers (1st Battalion of Engineers--hereafter separate lineage)
- 2d Battalion of Engineers expanded, reorganized, and redesignated 1 July-1 August 1916 as the 2d Regiment of Engineers
- 2d Regiment of Engineer expanded 21 May-20 June 1917 to form the 2d, 4th, and 5th Regiments of Engineers (2d and 4th Regiments of Engineers--hereafter separate lineages)
- 5th Regiment of Engineers redesignated 29 August 1917 as the 5th Engineers
- Assigned 6 December 1917 to the 7th Division
- Inactivated 27 September 1921 at Camp A. A. Humphreys, Virginia
- Relieved 11 January 1936 from assignment to the 7th Division and assigned to the 8th Division
- Activated 1 February 1936 at Fort Belvoir, Virginia
- Relieved 16 September 1939 from assignment to the 8th Division
- Redesignated 1 August 1942 as the 5th Engineer Combat Regiment
- Regiment broken up 27 December 1943 and its elements reorganized and redesignated as follows:
- 1st Battalion as the 1277th Engineer Combat Battalion
- (Headquarters and Headquarters and Service Company as Headquarters and Headquarters Company, 1128th Engineer Combat Group; 2d Battalion as the 1278th Engineer Combat Battalion--hereafter separate lineages)
- 1277th Engineer Combat Battalion (less Company C) inactivated 11 February 1946 at Camp Kilmer, New Jersey (Company C inactivated 18 February 1946 at Camp Kilmer, New Jersey)
- Redesignated 29 April 1947 as the 21st Engineer Combat Battalion
- Activated 1 October 1948 at Camp Carson, Colorado
- Redesignated 8 June 1953 as the 21st Engineer Battalion
- Inactivated 20 December 1957 at Fort Carson, Colorado
- Activated 24 June 1958 in Italy
- Inactivated 25 June 1959 in Italy
- Activated 1 May 1966 at West Point, New York
- Inactivated 16 October 2007 at West Point, New York
- Assigned 16 April 2014 to the 3d Brigade Combat Team, 101st Airborne Division, and activated at Fort Campbell, Kentucky
CAMPAIGN PARTICIPATION CREDIT
- Civil War
- Peninsula
- Antietam
- Fredericksburg
- Chancellorsville
- Wilderness
- Spotsylvania
- Cold Harbor
- Petersburg
- Appomattox
- Virginia 1863
- War with Spain
- Santiago
- Philippine Insurrection
- Streamer without inscription
- Mexican Expedition
- Mexico 1916-1917
- World War I
- Lorraine 1918
- World War II
- Normandy
- Northern France
- Rhineland
- Ardennes-Alsace
- Central Europe
DECORATIONS
BY ORDER OF THE SECRETARY OF THE ARMY:
ROBERT J. DALESSANDRO
Director, Center of Military History
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