Constituted 5 August 1917 in the National Army as the 309th Engineers and assigned to the 84th Division

Organized 27 August 1917 at Camp Zachary Taylor, Kentucky

Demobilized in July 1919 at Camp Sherman, Ohio

Reconstituted 13 August 1936 in the Organized Reserves; concurrently consolidated with the 309th Engineers (organized in November 1921 in the Organized Reserves with Headquarters at Indianapolis, Indiana; location of Headquarters changed 22 October 1931 to Terre Haute, Indiana; on 22 March 1934 to Indianapolis, Indiana) and consolidated unit designated as the 309th Engineers, an element of the 84th Division (later redesignated as the 84th Infantry Division)

Redesignated (less 2d Battalion) 23 February 1942 as the 309th Engineer Battalion (2d Battalion--hereafter separate lineage)

Ordered into active military service 15 October 1942 and reorganized at Camp Howze, Texas

Reorganized and redesignated 12 August 1943 as the 309th Engineer Combat Battalion

Inactivated 24 January 1946 at Camp Kilmer, New Jersey

Redesignated 19 December 1946 as the 309th Airborne Engineer Battalion (84th Infantry Division concurrently redesignated as the 84th Airborne Division)

Activated 26 February 1947 with Headquarters at Milwaukee, Wisconsin

(Organized Reserves redesignated 25 March 1948 as the Organized Reserve Corps; redesignated 9 July 1952 at the Army Reserve)

Reorganized and redesignated 1 March 1952 as the 309th Engineer Combat Battalion (84th Airborne Division concurrently redesignated as the 84th Infantry Division)

Reorganized and redesignated 1 January 1953 as the 309th Engineer Battalion

Disbanded (less Companies A and B) 18 May 1959 at Milwaukee, Wisconsin (Companies A and B--hereafter separate lineages)

Headquarters, 309th Engineer Battalion, reconstituted 24 November 1967 in the Army Reserve as Headquarters, 3d Brigade, 84th Division (Training)

Activated 31 January 1968 at Milwaukee, Wisconsin

Location changed 15 September 1993 to Fort McCoy, Wisconsin; on 30 September 1993 to St. Louis, Missouri

Inactivated 15 September 1995 at St. Louis, Missouri

Activated 16 November 1996 at Fort Snelling, Minnesota

Headquarters
3d Brigade, 84th Division (Training) Honors

Campaign Participation Credit

World War I: Streamer without inscription

World War II: Rhineland; Ardennes-Alsace; Central Europe

Decorations

None