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 Battalion of Engineers (hereafter separate lineage) and the 2d Battalion of Engineers

            2d Battalion of Engineers expanded 1 July-1 August 1916 to form the 2d Regiment of Engineers

            2d Regiment of Engineers expanded 21 May-20 June 1917 as follows:

Company C (see ANNEX), Company D (organized 24 August 1916 in Mexico), and part of Headquarters expanded 21 May 1917 to form the 5th Regiment of Engineers

(Companies A and B and part of Headquarters expanded 21 May 1917 to form the 2d Regiment of Engineers; Companies E and F and part of Headquarters expanded
4-20 June 1917 to form the 4th Regiment 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 Humphreys, Virginia

            Relieved 1 February 1936 from assignment to the 7th Division and activated at Fort Belvoir, Virginia

            Redesignated 1 August 1942 as the 5th Engineer Combat Regiment

            Regiment broken up 27 December 1943 and its elements reorganized and redesignated as follows:

Headquarters and Headquarters and Service Company as Headquarters and Headquarters Company, 1128th Engineer Combat Group

(1st and 2d Battalions as the 1277th and 1278th Engineer Combat Battalions, respectively--hereafter separate lineages)

            Headquarters and Headquarters Company, 1128th Engineer Combat Group, inactivated 30 December 1946 in Germany

            Redesignated 16 August 1950 as Headquarters and Headquarters Company, 20th Engineer Brigade

            Activated 28 August 1950 at Camp Leonard Wood, Missouri

            Inactivated 12 December 1958 at Fort Bragg, North Carolina

            Activated 1 May 1967 at Fort Bragg, North Carolina

            Inactivated 20 September 1971 in Vietnam

            Activated 21 June 1974 at Fort Bragg, North Carolina

ANNEX

            Constituted 3 August 1861 in the Regular Army as a company of engineers

            Organized in October 1861 at Boston, Massachusetts, as Company C, Corps of Engineers

            Redesignated 28 July 1866 as Company C, Battalion of Engineers

            Reorganized and redesignated 14 March 1901 as Company E, 2d Battalion of Engineers

            Reorganized and redesignated 1 August 1916 as Company C, 2d Regiment of Engineers

CAMPAIGN PARTICIPATION CREDIT

 

DECORATIONS

            Meritorious Unit Commendation (Army), Streamer embroidered VIETNAM 1967-1968

            Meritorious Unit Commendation (Army), Streamer embroidered VIETNAM 1968

            Meritorious Unit Commendation (Army), Streamer embroidered VIETNAM 1968-1970

            Meritorious Unit Commendation (Army), Streamer embroidered VIETNAM 1970-1971

            Meritorious Unit Commendation (Army), Streamer embroidered SOUTHWEST ASIA 1990-1991

            Meritorious Unit Commendation (Army), Streamer embroidered IRAQ 2004-2005

            Meritorious Unit Commendation (Army), Streamer embroidered IRAQ 2007-2008

            Republic of Vietnam Civil Action Honor Medal, First Class, Streamer embroidered VIETNAM 1967-1970

BY ORDER OF THE SECRETARY OF THE ARMY: