An armored cavalry regiment (ACR) is a regiment of the United States Army (Active Component, or Reserve Component (Army Reserve or Army National Guard)) organized for the specific purposes of reconnaissance, surveillance, and security. The regiments can be equipped with Cavalry Fighting Vehicles, tanks and helicopters. The light armored cavalry regiment was developed in the United States Army in the first years of the Cold War to replace the mechanized cavalry groups used during World War II. The new regiments primarily tasked with providing reconnaissance and security capabilities at the corps level, although also able to attack and defend either mounted or dismounted. The structure of each regiment included a headquarters and headquarters company and three reconnaissance battalions, each of which included a headquarters and service company, three reconnaissance companies, and a medium tank company. 1 to 100 - United States Army 2nd Armored Cavalry Regiment (now a Stryker Brigade Combat Team (BCT)) 3rd Armored Cavalry Regiment (now a Stryker BCT) 6th Armored Cavalry Regiment (converted to a U.S. Army Regimental System (USARS) aviation regiment) 11th Armored Cavalry Regiment (now an Armored BCT) 14th Armored Cavalry Regiment (converted to an USARS cavalry regiment) 17th Cavalry Regiment (Armored) (converted to an USARS parent regiment) 101 to 278 - Army National Guard 101st Armored Cavalry Regiment – Redesignated from existing units 1950 in the New York Army National Guard. Broken up and units redesignated 1959. 102nd Armored Cavalry Regiment – Redesignated from existing units 1949 in the New Jersey Army National Guard. Broken up and units redesignated 1968. 103rd Armored Cavalry Regiment – Redesignated from existing units 1959 in the Maine Army National Guard, reorganized 1961 as 20th Armor. 104th Armored Cavalry Regiment – Organized 1950 in the Pennsylvania Army National Guard. 3rd Squadron in New Jersey Army National Guard from 1968. Broken up and units redesignated 1975. 107th Armored Cavalry Regiment (converted to an USARS cavalry regiment.) 108th Armored Cavalry Regiment - Organized as the 750th Tank Battalion in the Mississippi Army National Guard with headquarters at Senatobia, MS, from 16 Feb-28 May 1956. Expanded, reorganized and redesignated with 1st, 2nd and 3rd Recce Squadrons, 108th Armored Cavalry Regiment, 1 May 1959. Ordered into Federal Service from 30 September 1962 – 23 October 1962. In 1968 the regimental headquarters became 1st Brigade, 30th Armored Division, MSARNG. 2nd and 3rd Recce Squadrons consolidated 15 February 1968 with 1st Squadron, 108th Armored Cavalry