The United States Army Regimental System (USARS) is an organizational and classification system used by the United States Army. It was established in 1981 to replace the Combat Arms Regimental System (CARS) to provide each soldier with continuous identification with a single regiment, and to increase a soldier's probability of serving recurring assignments with their regiment. The USARS was intended to enhance combat effectiveness by providing the opportunity for a regimental affiliation, thus obtaining some of the benefits of the traditional regimental system.

Overview

USARS was developed to include all combat, combat support (CS), combat service support (CSS), special branches, and training battalions in the Regular Army, Army National Guard, and Army Reserve.

It was developed to offer the opportunity for long-term identification with a regiment or corps, provide the potential for recurring assignments within a regiment or corps, provide the opportunity to further emphasize the history, customs, and traditions of the regiment or corps, and provide regiments that are structured as one or more continental United States (CONUS) units of like type linked with one or more units of like type outside the continental United States (OCONUS), or one or more units of like type located exclusively in either CONUS or OCONUS, including one or more training battalions or tactical armored cavalry or ranger regiments.

USARS is also designed to provide for CS, CSS, and special branches to operate on a “whole branch” concept as a corps or special branch, carrying on the activities and traditions of a regiment, offer regimental affiliation to allow soldiers the opportunity for continuous identification with a combat arms regiment, a corps, or special branch throughout their careers. USARS provides (through regimental affiliation) different opportunities for soldiers, depending upon which combat arms regiment they choose to be affiliated with or whether they affiliate with a CS or CSS corps or special branch. In addition, the regimental affiliation process allows combat arms soldiers to select the regiment of choice (soldiers can change their affiliation at any time); provides that CS, CSS, and special branch soldiers will automatically be affiliated with their corps or special branch; specifies that all soldiers will belong to a regiment or corps; permits no limit to the number of soldiers who can be affiliated with a regiment or corps; and provides that DA civilians can automatically be affiliated with a regiment or corps by direction of the regiment or corps commander.

Combat arms Concept Combat arms is a rescinded doctrinal term, though colloquially it includes air defense artillery, armor, aviation, cyber, field artillery, infantry, and special forces regiments. Combat arms soldiers may affiliate with any of the combat arms regiments consistent with their primary military occupational specialty (PMOS), specialty code, special qualification identifiers (SQI), or additional skill identifiers (ASI). Soldiers will have greater opportunities to serve recurring assignments in their regiments if regiments are chosen that have battalions in both CONUS and OCONUS locations. Since there is no ceiling on the number of soldiers who can affiliate with a particular regiment, the potential for recurring assignments to regiments is diminished where the number of affiliated soldiers exceeds the requirements.

Affiliation policy Quoting from Chapter 3–2, page 7 of Army Regulation 600-82, U.S. Army Regimental System (note: Currently the regulation for The U.S. Army Regimental System is Army Regulation 870-21):

Combat arms regiments Note: There are currently 178 USARS regiments, with only 47 consisting of units at multiple locations. Some of the regimental battalions are assigned to brigade combat teams in multiple divisions. Only 27 of these regiments meet the USARS "Conus/Oconus goal." Additionally, the term "Regiment" was not officially appended to a USARS regiment's official name/designation (and was not used under CARS) until 2005.

Artillery regiments Air defense artillery regiments 1st Air Defense Artillery Regiment 1st Battalion, 38th Air Defense Artillery Brigade, Kadena Air Base, Japan 2nd Battalion, 35th Air Defense Artillery Brigade, Camp Carroll, South Korea 2nd Air Defense Artillery Regiment Battery A, 11th Air Defense Artillery Brigade, Fort Bliss, Texas Battery B, 11th Air Defense Artillery Brigade, Fort Bliss, Texas Battery D, 35th Air Defense Artillery Brigade, Camp Carroll, South Korea 3rd Battalion, 31st Air Defense Artillery Brigade, Fort Sill, Oklahoma 3rd Air Defense Artillery Regiment 4th Battalion, 31st Air Defense Artillery Brigade, Fort Sill, Oklahoma 4th Air Defense Artillery Regiment Battery A, 11th Air Defense Artillery Brigade, Fort Bliss, Texas 3rd Battalion, 108th Air Defense Artillery Brigade, Fort Bragg, North Carolina 5th Air Defense Artillery Regiment 4th Battalion, 69th Air Defense Artillery Brigade, Fort Hood, Texas 5th Battalion, 31st Air Defense Artillery Brigade, Fort Sill, Oklahoma 6th Air Defense Artillery Regiment (Training Regiment) 2nd Battalion, 30th Air Defense Artillery Brigade, Fort Sill, Oklahoma 3rd Battalion, 30th Air Defense Artillery Brigade, Fort Sill, Oklahoma 7th Air Defense Artillery Regiment 1st Battalion, 108th Air Defense Artillery Brigade, Fort Bragg, North Carolina 5th Battalion, 52nd Air Defense Artillery Brigade, Germany 43rd Air Defense Artillery Regiment 1st Battalion, 11th Air Defense Artillery Brigade, Fort Bliss, Texas 2nd Battalion, 11th Air Defense Artillery Brigade, Fort Bliss, Texas 3rd Battalion, 11th Air Defense Artillery Brigade, Fort Bliss, Texas 44th Air Defense Artillery Regiment 1st Battalion, 69th Air Defense Artillery Brigade, Fort Hood, Texas 2nd Battalion, 108th Air Defense Artillery Brigade, Fort Campbell, Kentucky 52nd Air Defense Artillery Regiment 5th Battalion, 11th Air Defense Artillery Brigade, Fort Bliss, Texas 6th Battalion, 35th Air Defense Artillery Brigade, Camp Humphreys, South Korea 55th Air Defense Artillery Regiment 2nd Battalion, 108th Air Defense Artillery Brigade, Fort Bragg, North Carolina 56th Air Defense Artillery Regiment 6th Battalion, 1st Cavalry Division, Fort Hood, Texas 57th Air Defense Artillery Regiment 1st Battalion, 52nd Air Defense Artillery Brigade, Germany 62nd Air Defense Artillery Regiment 1st Battalion, 69th Air Defense Artillery Brigade, Fort Hood, Texas

Field artillery regiments 1st Field Artillery Regiment 4th Battalion, 3rd BCT, 1st Armored Division, Fort Bliss, Texas 2nd Field Artillery Regiment 2nd Battalion, 428th Field Artillery Brigade, Fort Sill, Oklahoma 3rd Field Artillery Regiment 2nd Battalion, 1st ABCT, 1st Armored Division, Fort Bliss, Texas 5th Battalion, 17th Field Artillery Brigade, I Corps, Joint Base Lewis-McChord, Washington 4th Field Artillery Regiment

5th Field Artillery Regiment 1st Battalion, 1st BCT, 1st Infantry Division, Fort Riley, Kansas

6th Field Artillery Regiment 3rd Battalion, 1st BCT, 10th Mountain Division (Light Infantry), Fort Drum, New York 7th Field Artillery Regiment 1st Battalion, 2nd BCT, 1st Infantry Division, Fort Riley, Kansas 3rd Battalion, 3rd BCT, 25th Infantry Division, Schofield Barracks, Hawaii 8th Field Artillery Regiment 2nd Battalion, 1st BCT, 25th Infantry Division, Fort Wainwright, Alaska 9th Field Artillery Regiment 1st Battalion, 2nd BCT, 3rd Infantry Division, Fort Stewart, Georgia 10th Field Artillery Regiment

11th Field Artillery Regiment 2nd Battalion, 2nd BCT, 25th Infantry Division, Schofield Barracks, Hawaii 12th Field Artillery Regiment 2nd Battalion, 1st BCT, 4th Infantry Division, Fort Carson, Colorado 13th Field Artillery Regiment 3rd Battalion, 75th Field Artillery Brigade, Fort Sill, Oklahoma 14th Field Artillery Regiment

15th Field Artillery Regiment 1st Battalion, 1st BCT, 2nd Infantry Division, South Korea 2nd Battalion, 2nd BCT, 10th Mountain Division (Light Infantry), Fort Drum, New York 16th Field Artillery Regiment 3rd Battalion, 2nd BCT, 1st Cavalry Division, Fort Hood, Texas 17th Field Artillery Regiment 1st Battalion, 75th Field Artillery Brigade, Fort Sill, Oklahoma 3rd Battalion, 2nd BCT, 2nd Infantry Division, Joint Base Lewis-McChord, Washington 18th Field Artillery Regiment 2nd Battalion, 75th Field Artillery Brigade, Fort Sill, Oklahoma 19th Field Artillery Regiment 1st Battalion, 434th Field Artillery Brigade, Fort Sill, Oklahoma 20th Field Artillery Regiment 2nd Battalion, 41st Field Artillery Brigade, Fort Hood, Texas 21st Field Artillery Regiment 1st Battalion, 41st Field Artillery Brigade, Fort Hood, Texas 22nd Field Artillery Regiment 1st Battalion, 434th Field Artillery Brigade, Fort Sill, Oklahoma 25th Field Artillery Regiment 5th Battalion, 3rd BCT, 10th Mountain Division (Light Infantry), Fort Polk, Louisiana 26th Field Artillery Regiment Battery A (Target Acquisition), 41st Field Artillery Brigade, V Corps, Grafenwohr, Germany Battery B (Target Acquisition), 212th Field Artillery Brigade, III Corps, Fort Bliss, Texas Battery C (Target Acquisition), 75th Field Artillery Brigade, III Corps, Fort Sill, Oklahoma Battery D (Target Acquisition), 18th Field Artillery Brigade, XVIII Airborne Corps, Fort Bragg, North Carolina Battery F (Target Acquisition), 17th Field Artillery Brigade, I Corps, Fort Lewis, Washington

27th Field Artillery Regiment 3rd Battalion, 18th Field Artillery Brigade, XVIII Airborne Corps, Fort Bragg, North Carolina 4th Battalion, 2nd BCT, 1st Armored Division, Fort Bliss, Texas 29th Field Artillery Regiment 2nd Battalion, 4th BCT, 1st Armored Division, Fort Bliss, Texas 3rd Battalion, 3rd BCT, 4th Infantry Division, Fort Carson, Colorado 30th Field Artillery Regiment 1st Battalion, 428th Field Artillery Brigade, Fort Sill, Oklahoma 32nd Field Artillery Regiment 2nd Battalion, 4th BCT, 1st Infantry Division, Fort Riley, Kansas 37th Field Artillery Regiment 1st Battalion, 3rd BCT (Stryker), 2nd Infantry Division, Fort Lewis, Washington 6th Battalion, 210th Field Artillery Brigade, 2nd Infantry Division, South Korea 38th Field Artillery Regiment 1st Battalion, 210th Field Artillery Brigade, 2nd Infantry Division, South Korea 40th Field Artillery Regiment 1st Battalion, 434th Field Artillery Brigade, Fort Sill, Oklahoma 41st Field Artillery Regiment 1st Battalion, 1st BCT, 3rd Infantry Division, Fort Stewart, Georgia 42nd Field Artillery Regiment 4th Battalion, 1st BCT, 4th Infantry Division, Carson, Colorado 76th Field Artillery Regiment

77th Field Artillery Regiment 2nd Battalion, 4th BCT, 4th Infantry Division, Fort Carson, Colorado 78th Field Artillery Regiment 1st Battalion, 428th Field Artillery Brigade, Fort Sill, Oklahoma 79th Field Artillery Regiment 1st Battalion, 434th Field Artillery Brigade, Fort Sill, Oklahoma 82nd Field Artillery Regiment 1st Battalion, 1st BCT, 1st Cavalry Division, Fort Hood, Texas 2nd Battalion, 3rd BCT, 1st Cavalry Division, Fort Hood, Texas 84th Field Artillery Regiment 94th Field Artillery Regiment 1st Battalion, 17th Field Artillery Brigade, I Corps, Joint Base Lewis-Mcchord, Washington 194th Field Artillery Regiment 1st Battalion, 2nd BCT, 34th Infantry Division, Fort Dodge, Iowa 319th Field Artillery Regiment (Airborne) 1st Battalion, 3rd BCT, 82nd Airborne Division, Fort Bragg, North Carolina 2nd Battalion, 2nd BCT, 82nd Airborne Division, Fort Bragg, North Carolina 3rd Battalion, 1st BCT, 82nd Airborne Division, Fort Bragg, North Carolina 4th Battalion, 173rd ABCT, Grafenwoehr, Germany 320th Field Artillery Regiment (Air Assault) 1st Battalion, 2nd BCT, 101st Airborne Division (Air Assault), Fort Campbell, Kentucky 2nd Battalion, 1st BCT, 101st Airborne Division (Air Assault), Fort Campbell, Kentucky 3rd Battalion, 3rd BCT, 101st Airborne Division (Air Assault), Fort Campbell, Kentucky 321st Field Artillery Regiment