Organized in 1861 at Concord as the Concord Volunteers.
Mustered into federal service 3 June 1861 at Portsmouth as Company E, 2d New Hampshire Volunteer Infantry; mustered out of federal service 19 December 1865 at Cabin Point, Virginia.
Reorganized 31 October 1865 in the New Hampshire Volunteer Militia at Concord as the State Capitol Guards.
Redesignated 24 September 1866 as Company F (State Capitol Guards), 1st Regiment.
Disbanded in 1869 at Concord.

Reorganized 15 March 1877 in the New Hampshire Volunteer Militia at Concord as Company K (State Capitol Guards), 2d Regiment.
Redesignated 18 April 1878 as Company C (State Capitol Guards), 3d Regiment (New Hampshire Volunteer Militia redesignated 1 April 1879 as the New Hampshire National Guard).
Mustered into federal service 8 May 1898 at Concord as Company C, 1st New Hampshire Volunteer Infantry; mustered out of federal service 31 October 1898 at Concord and reorganized as Company C, 3d Regiment.
Redesignated 23 January 1900 as Company C, 2d Regiment.
Redesignated 15 April 1909 as Company C, 1st Infantry.
Mustered into federal service 30 June 1916 at Concord; mustered out of federal service 20 February 1917 at Concord.
Mustered into federal service 25 July 1917 at Concord; drafted into federal service 5 August 1917.
Reorganized and redesignated 11 February 1918 as Company C, First Army Headquarters Regiment.
Demobilized 26 January 1919 at Camp Dix, New Jersey.

Reorganized and federally recognized 24 April 1922 in the New Hampshire National Guard at Concord as Headquarters Battery, 197th Artillery (Coast Artillery Corps).
Redesignated 23 April 1924 as Headquarters Battery, 197th Coast Artillery (United States).
Inducted into federal service 16 September 1940 at Concord.
Reorganized and redesignated 15 May 1943 as Headquarters and Headquarters Battery, 197th Antiaircraft Artillery Group.
Inactivated 28 December 1945 at Camp Stoneman, California.

Reorganized and federally recognized 15 April 1947 at Concord.
Ordered into active federal service 14 August 1950 at Concord; released 13 August 1952 from active federal service and reverted to state control.
Consolidated 1 February 1959 with Battery A, 744th Antiaircraft Artillery Battalion see ANNEX 1), and consolidated unit reorganized and redesignated as Headquarters and Headquarters Battery, 197th Artillery Group.

Consolidated 1 December 1967 with Headquarters and Headquarters Battery, II Corps Artillery (see ANNEX 2), and consolidated unit designated as Headquarters and Headquarters Battery, 197th Artillery Group; location concurrently changed to Manchester.
Redesignated 1 November 1971 as Headquarters and Headquarters Battery, 197th Field Artillery Group.
Redesignated 1 September 1978 as Headquarters and Headquarters Battery, 197th Field Artillery Brigade.
Consolidated 30 June 1993 with Battery A, 197th Field Artillery (see ANNEX 3), and consolidated unit designated as Headquarters and Headquarters Battery, 197th Field Artillery Brigade.

Ordered into active Federal service 3 January 2004 at Manchester; released from active Federal service 30 June 2005 and reverted to state control.
Reorganized and redesignated 1 September 2008 as Headquarters and Headquarters Battery, 197th Fires Brigade.
Ordered into active Federal service 11 September 2010 at Manchester; released from active Federal service 15 October 2011 and reverted to state control.
Organized in 1861 at Concord as the Concord Volunteers. Mustered into federal service 3 June 1861 at Portsmouth as Company E, 2d New Hampshire Volunteer Infantry; mustered out of federal service 19 December 1865 at Cabin Point, Virginia. Reorganized 31 October 1865 in the New Hampshire Volunteer Militia at Concord as the State Capitol Guards. Redesignated 24 September 1866 as Company F (State Capitol Guards), 1st Regiment. Disbanded in 1869 at Concord.
Reorganized 15 March 1877 in the New Hampshire Volunteer Militia at Concord as Company K (State Capitol Guards), 2d Regiment. Redesignated 18 April 1878 as Company C (State Capitol Guards), 3d Regiment (New Hampshire Volunteer Militia redesignated 1 April 1879 as the New Hampshire National Guard). Mustered into federal service 8 May 1898 at Concord as Company C, 1st New Hampshire Volunteer Infantry; mustered out of federal service 31 October 1898 at Concord and reorganized as Company C, 3d Regiment. Redesignated 23 January 1900 as Company C, 2d Regiment. Redesignated 15 April 1909 as Company C, 1st Infantry. Mustered into federal service 30 June 1916 at Concord; mustered out of federal service 20 February 1917 at Concord. Mustered into federal service 25 July 1917 at Concord; drafted into federal service 5 August 1917. Reorganized and redesignated 11 February 1918 as Company C, First Army Headquarters Regiment. Demobilized 26 January 1919 at Camp Dix, New Jersey.
Reorganized and federally recognized 24 April 1922 in the New Hampshire National Guard at Concord as Headquarters Battery, 197th Artillery (Coast Artillery Corps). Redesignated 23 April 1924 as Headquarters Battery, 197th Coast Artillery (United States). Inducted into federal service 16 September 1940 at Concord. Reorganized and redesignated 15 May 1943 as Headquarters and Headquarters Battery, 197th Antiaircraft Artillery Group. Inactivated 28 December 1945 at Camp Stoneman, California.
Reorganized and federally recognized 15 April 1947 at Concord. Ordered into active federal service 14 August 1950 at Concord; released 13 August 1952 from active federal service and reverted to state control. Consolidated 1 February 1959 with Battery A, 744th Antiaircraft Artillery Battalion see ANNEX 1), and consolidated unit reorganized and redesignated as Headquarters and Headquarters Battery, 197th Artillery Group.
Consolidated 1 December 1967 with Headquarters and Headquarters Battery, II Corps Artillery (see ANNEX 2), and consolidated unit designated as Headquarters and Headquarters Battery, 197th Artillery Group; location concurrently changed to Manchester. Redesignated 1 November 1971 as Headquarters and Headquarters Battery, 197th Field Artillery Group. Redesignated 1 September 1978 as Headquarters and Headquarters Battery, 197th Field Artillery Brigade. Consolidated 30 June 1993 with Battery A, 197th Field Artillery (see ANNEX 3), and consolidated unit designated as Headquarters and Headquarters Battery, 197th Field Artillery Brigade.
Ordered into active Federal service 3 January 2004 at Manchester; released from active Federal service 30 June 2005 and reverted to state control. Reorganized and redesignated 1 September 2008 as Headquarters and Headquarters Battery, 197th Fires Brigade. Ordered into active Federal service 11 September 2010 at Manchester; released from active Federal service 15 October 2011 and reverted to state control.
197th Field Artillery Brigade