- Organized 5 February 1916 in the Louisiana National Guard at Alexandria as Company M, 1st Regiment of Infantry
- (1st Regiment of Infantry mustered into Federal service 25-29 June 1916 at Camp Stafford, Louisiana; mustered out of Federal service 25 September 1916 at Camp Stafford, Louisiana)
- Called into Federal service 10 April 1917 at Camp Nicholls, Louisiana; drafted into Federal service 5 August 1917 at Camp Beauregard, Louisiana
- Reorganized and redesignated 27 September 1917 as Company M, 156th Infantry, and assigned to the 39th Division
- Demobilized 23 January 1919 at Camp Beauregard, Louisiana
- Reorganized and Federally recognized 24 August 1921 in the Louisiana National Guard at Alexandria as Company A, 156th Infantry
- (156th Infantry assigned 4 August 1922 to the 39th Division; relieved 1 July 1923 from assignment to the 39th Division and assigned to the 31st Division)
- Reorganized and redesignated 1 December 1926 as the Howitzer Company, 156th Infantry
- Reorganized and redesignated 1 September 1939 as Company D, 156th Infantry
- Reorganized and redesignated 13 January 1940 as Company M, 156th Infantry
- Inducted into Federal service 25 November 1940 at Alexandria
- (156th Infantry relieved 14 July 1942 from assignment to the 31st Division)
- Inactivated 13 March 1946 at Camp Kilmer, New Jersey
- Reorganized and redesignated 27 May 1946 as Company F, 199th Infantry
- (199th Infantry assigned 28 May 1946 to the 39th Infantry Division)
- Reorganized and Federally recognized 8 April 1947 in the Louisiana National Guard at Alexandria
- Consolidated 1 July 1959 with the Medical Detachment, 773d Tank Battalion (see ANNEX), and consolidated unit designated as the 415th Ordnance Company
- Converted, reorganized, and redesignated 1 December 1967 as Company D, 205th Engineer Battalion and relieved from assignment to the 39th Infantry Division
- Reorganized and redesignated 1 October 1972 as Company C, 769th Engineer Battalion
Location changed 1 June 1975 to Pineville
- Reorganized and redesignated 1 November 1975 as Company A, 527th Engineer Battalion
- Reorganized and redesignated 1 September 1989 as Detachment 1, Headquarters and Service Company, 527th Engineer Battalion
- Ordered into active Federal service 6 December 1990 at Pineville; released from active Federal service 25 May 1991 and reverted to state control
- Reorganized and redesignated 1 July 1991 as Company A, 527th Engineer Battalion
- Ordered into active Federal service 3 January 2003 at Pineville; released from active Federal service 3 January 2004 and reverted to state control
- Reorganized and redesignated 1 September 2006 as the 844th Engineer Company
- ANNEX
- Constituted 3 December 1941 in the Army of the United States as the Medical Detachment, 773d Tank Destroyer Battalion
- Activated 15 December 1941 at Camp Shelby, Mississippi
- Inactivated 23 October 1945 at Hampton Roads, Virginia
- Redesignated 17 June 1946 as the Medical Detachment, 773d Tank Battalion and allotted to the Louisiana National Guard
- Organized and Federally recognized 8 April 1947 in the Louisiana National Guard at Alexandria
- Reorganized and redesignated 18 October 1949 as the Medical Detachment, 773d Heavy Tank Battalion
- Ordered into active Federal service 5 October 1950 at Alexandria
- Reorganized and redesignated 17 November 1950 as the Medical Detachment, 773d Medium Tank Battalion
- Redesignated 19 February 1951 as the Medical Detachment, 773d Tank Battalion
- (Medical Detachment, 773d Tank Battalion [NGUS] organized and Federally recognized 12 December 1952 at Alexandria)
- Released from active Federal service 2 November 1954 and reverted to state control; concurrently, Federal recognition withdrawn from the Medical Detachment, 773d Tank Battalion (NGUS)
HOME STATION: Pineville (less detachments at Ruston and West Monroe)