Mustered into Federal service 9 May 1898 at the Presidio of San Francisco as the 7th California Volunteer Infantry; mustered out of Federal service 2 December 1898 at Los Angeles
Mustered into Federal service 29 June 1916 at Sacramento; mustered out of Federal service 11 November 1916 at Los Angeles Drafted into Federal service 5 August 1917
Consolidated 25 September-1 November 1917 with the 2d Battalion, Companies L and M, and the Sanitary Detachment, 2d Infantry Regiment; consolidated unit reorganized and redesignated as the 160th Infantry and assigned to the 40th Division
Demobilized 7 May 1919 at Camp Kearny, California
Former southern California elements reorganized 23 August-6 October 1921 in the California National Guard as the 160th Infantry and assigned to the 40th Division; Headquarters Federally recognized 31 January 1922 at Los Angeles
2d Battalion 160th Infantry, reorganized and redesignated 1 April 1929 as the 2d Battalion, 185th Infantry, an element of the 40th Division (160th Infantry - hereafter separate lineage)
Expanded, reorganized, and redesignated March-April 1930 as the 2d and 3d Battalions, 185th Infantry, elements of the 40th Division (later designated as the 40th Infantry Division)
Inducted into Federal service 3 March 1941 at home stations Inactivated 7 April 1946 at Camp Stoneman, California
2d Battalion, 185th Infantry, redesignated 5 August 1946 as the 223d Infantry and remained assigned to the 40th Infantry Division (3d Battalion, 185th
Infantry, concurrently redesignated as the 224th Infantry - hereafter separate lineage)
223d Infantry organized and Federally recognized 15 October 1946 with Headquarters at Pasadena Ordered into active Federal service 1 September 1950 at home stations
(223d Infantry [NGUS] organized and Federally recognized 2 September 1952 with Headquarters at Pasadena)
Released 30 June 1954 from active Federal service and reverted to state control; Federal recognition concurrently withdrawn from the 223d Infantry (NGUS)
2d Battalion, 223d Infantry, consolidated with the 3d Battalion, 111th Armored Cavalry (organized and Federally recognized 26 January 1951 with Headquarters at Van Nuys [changed 1 November 1951 to Burbank]); consolidated unit concurrently reorganized and redesignated as the 139th Tank Battalion, with Headquarters at Burbank, and assigned to the 40th Armored Division (223d Infantry - hereafter separate lineage)
139th Tank Battalion reorganized and redesignated 1 July 1959 as the 2d Medium Tank Battalion, 185th Armor, an element of the 40th Armored Division
Reorganized and redesignated 1 March 1963 as the 1st Reconnaissance Squadron, 18th Armored Cavalry, and relieved from assignment to the 40th Armored Division
Reorganized and redesignated 1 November 1965 as the 1st Squadron, 18th Armored Cavalry
Ordered into active Federal service 13 May 1968 at home stations; released 12 December 1969 from active Federal service and reverted to state control
Reorganized and redesignated 13 January 1974 as the 18th Cavalry, a parent regiment under the Combat Arms Regimental System, to consist of the 1st Squadron, an element of the 40th Infantry Division
Withdrawn 19 January 1988 from the Combat Arms Regimental System and reorganized under the United States Army Regimental System
Campaign Participation Credit
Streamer without inscription
Luzon (with arrowhead)
Southern Philippines (with arrowhead)
Korea, Summer-Fall 1952
Third Korean Winter
Korea, Summer 1953
Decorations
Philippine Presidential Unit Citation, Streamer embroidered 17 OCTOBER 1944 TO 4 JULY 1945
Republic of Korea Presidential Unit Citation, Streamer embroidered KOREA 1952-1953