Shared lineage with the 180th Infantry Regiment Parent unit constituted in 1890 in the Oklahoma Volunteer Militia as the 1st Infantry Regiment. (Oklahoma Volunteer Militia redesignated in 1895 as the Oklahoma National Guard.) Organized 21 December 1895 from existing units with headquarters at Guthrie. Consolidated with elements from Arizona, New Mexico, and the Indian Territory and mustered into federal service 4–23 July 1898 as the 1st Territorial Volunteer Infantry; mustered out of federal service 11–15 February 1899 at
Albany, Georgia. Former 1st infantry Regiment reorganized in 1899 in the Oklahoma National Guard as the 1st Infantry with headquarters at Guthrie. Mustered into federal service 27 June - 1 July 1916 at
Fort Sill, Oklahoma; mustered out of federal service 1 March 1917 at Fort Sill, Oklahoma. Mustered into federal service 5 August 1917 at Fort Sill, Oklahoma; concurrently, drafted into federal service. Consolidated 15 October 1917 with the 7th Infantry, Texas National Guard; consolidated unit concurrently reorganized and redesignated as the 142d Infantry and assigned to the 36th Division. Demobilized 17 June 1919 at
Camp Bowie, Texas. Elements of the former 1st Infantry in eastern Oklahoma consolidated 1920–1921 with elements of the 3d Infantry (organized and federally recognized 3 September 1918 in the Oklahoma National Guard with headquarters at Muskogee) and consolidated unit designated as the 3d Infantry (elements of the former 1st Infantry in central Oklahoma consolidated with the 2d Infantry - hereafter separate lineage.) Redesignated 14 October 1921 as the 180th Infantry and assigned to the 45th Division. Inducted into federal service 16 September 1940 at home stations. (45th Division redesignated 11 February 1942 as the 45th Infantry Division.) Inactivated 22–29 November 1945 at Camp Bowie, Texas.
New separate lineage Former elements of the 180th Infantry in northeastern Oklahoma were reorganized and federally recognized on 20 September 1946 as the 279th Infantry, with headquarters at Okmulgee. Former elements of the 180th Infantry in southeastern Oklahoma were reorganized as the 180th Infantry – hereafter a separate lineage. Ordered into active federal service 1 September 1950 at home stations. (279th Infantry [NGUS] organized and federally recognized 30 October 1952 with headquarters at Okmulgee.) Released 30 April 1954 from active federal service and reverted to state control; federal recognition concurrently withdrawn from the 279th Infantry (NGUS). Reorganized 1 May 1959 as a parent regiment under the Combat Arms Regimental System to consist of the 1st Battle Group, an element of the 45th Infantry Division. Reorganized 1 April 1963 to consist of the 1st and 2d Battalions, elements of the 45th Infantry Division. Reorganized 1 February 1968 to consist of the 1st Battalion, an element of the 45th Infantry Brigade. Withdrawn 1 May 1989 from the Combat Arms Regimental System and reorganized under the
United States Army Regimental System. Reorganized 1 November 2005 to consist of the 1st Battalion, an element of the 45th Infantry Brigade. (1st Battalion ordered into active federal service 20 January 2004 at home stations; released from active federal service 17 July 2005 and reverted to state control.) Redesignated 1 October 2005 as the 279th Infantry Regiment. (1st Battalion ordered into active federal service 19 October 2007 at home stations.) Converted and redesignated 1 September 2008 as the 279th Cavalry Regiment. (1st Squadron released from active federal service 21 November 2008 and reverted to state control.) Converted and redesignated 1 December 2008 as the 279th Infantry Regiment. (1st Battalion ordered into active federal service 31 March 2011 at home stations; released from active federal service 3 May 2012 and reverted to state control.) ==Current units==