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The structure of the United States Army is complex, and can be interpreted in several different ways: active/reserve, operational/administrative, and branches/functional areas.
From time to time the Department of the Army issues Department of the Army General Orders. In addition to base closures, unit citations, certain awards such as the Medal of Honor and Legion of Merit, they may concern the creation of JROTC units and structural changes to the Army. These are listed by year on the Army Publishing Directorate's website.
This page aims to portray the current overall structure of the US Army.
Prior to 1903, members of the National Guard were considered state soldiers unless federalized by the President. Since the Militia Act of 1903, all National Guard soldiers have held dual status: as National Guardsmen under the authority of the governors of their states and as a reserve of the U.S. Army under the authority of the President. Since the adoption of the total force policy, in the aftermath of the Vietnam War, reserve component soldiers have taken a more active role in U.S. military operations. Reserve and Guard units took part in the Gulf War, peacekeeping in Kosovo, and the 2003 invasion of Iraq. Although the present-day Army exists as an all-volunteer force, augmented by Reserve and National Guard forces, measures exist for emergency expansion in the event of a catastrophic occurrence, such as a large scale attack against the U.S. or the outbreak of a major global war.
The final stage of Army mobilization, known as "activation of the unorganized militia" would effectively place all able-bodied males in the service of the U.S. Army.
During World War I, the "National Army" was organized to fight the conflict. [1] It was demobilized at the end of World War I.
After World War I, former units were replaced by the Regular Army, the Organized Reserve Corps, and the State Militias. In the 1920s and 1930s, the "career" soldiers were known as the "Regular Army" with the "Enlisted Reserve Corps" and "Officer Reserve Corps" augmented to fill vacancies when needed. [2]
In 1941, the "Army of the United States" was founded to fight World War II. The Regular Army, Army of the United States, the National Guard, and Officer/Enlisted Reserve Corps (ORC and ERC) existed simultaneously.[ citation needed ]
After World War II, the ORC and ERC were combined into the United States Army Reserve. The Army of the United States was re-established for the Korean War and Vietnam War and was demobilized upon the suspension of the Draft. [2] [ dead link ]
The United States Army is made up of three components: one active—the Regular Army; and two reserve components—the Army National Guard and the Army Reserve. Both reserve components are primarily composed of part-time soldiers who train once a month, known as Battle Assembly, Unit Training Assemblies (UTAs), or simply "drills", while typically conducting two to three weeks of annual training each year. Both the Regular Army and the Army Reserve are organized under Title 10 of the United States Code. The National Guard is organized under Title 32. While the Army National Guard is organized, trained, and equipped as a component of the U.S. Army, individual units are under the command of individual states' governors. However, units of the National Guard can be federalized by presidential order and against the governor's wishes. [3]
The U.S. Army is led by a civilian Secretary of the Army, who reports to the secretary of defense, and serves as civilian oversight for the Chief of Staff of the United States Army (CSA). The CSA is assisted by the Vice Chief of Staff of the United States Army. The CSA is a member of the Joint Chiefs of Staff, a body composed of the service chiefs from each service who advise the President of the United States and secretary of defense on military matters under the guidance of the chairman and vice chairman of the Joint Chiefs of Staff.
The Inspector General of the Army (IG) maintains open channels of communication for extraordinary issues which might lie outside the purview of the chain of command; it lists points of contact for the 3 Army Commands (ACOMs), the 11 Army Service Component Commands (ASCCs), and 12 Direct Reporting Units (DRUs). [4] IG teams might then be assigned to a case, if need be, to perform inspections, assessments, and investigations. [5]
Army Commands (ACOMs) and Army Service Component Commands (ASCCs) serve different purposes. The ACOMs are: Forces Command, Futures Command, Materiel Command, and Training and Doctrine Command.
Some of the Army Service Component Commands (ASCCs) are components of the six geographical Unified Combatant Commands (CCMDs). Other ASCCs serve the functional CCMDs.
Army Cyber Command is a component of United States Cyber Command. The commander of Army Cyber used to serve as commander of Second Army. Up until 2017, Second Army was a direct reporting unit to the Army CIO/G-6, with the CIO reporting to the Secretary of the Army, while the G-6 reports to the Army Chief of Staff. A 2017 reorganization eliminated the need for Second Army's network operations coordinating function, and the headquarters was inactivated on 31 March 2017. [10] Army Network Enterprise Technology Command formerly reporting directly to the CIO/G-6, was a component of Second Army. The numerical designation 9th Army Signal Command has now been removed from NETCOM.
In addition, the Army's Special Operations Command administers its Joint Operations units; Space and Missile Defense Command provides global satellite-related infrastructure, and missile defense for the combatant commands, and for the nation. Surface Deployment and Distribution Command provides transport.
Headquarters, United States Department of the Army (HQDA):
Most U.S. Army units can be operationally divided into the following components from largest to smallest:
Regular Army Divisions
Army National Guard Divisions
US Army Combat Brigades after the current round of deactivations / re-organizations: 31
Recently the US Army has reorganized several BCTs, which would bring the totals to 11 ABCTs, 6 SBCTs, and 14 IBCTs. [46]
Combat formations of the US Army at below brigade level include the United States Army Special Forces groups and several reserve separate battalions (100–442 Inf (USAR), 3-172 Inf (Mtn) (Vermont Army National Guard) etc.).
Personnel in the Army work in various branches, which is their area of training or expertise. Traditionally, the branches were divided into three groups combat arms, combat support, and combat service support. Currently, the Army classifies its branches as maneuver, fires, and effects; operations support; and force sustainment.
Basic branches - contain groupings of military occupational specialties (MOS) in various functional categories, groups, and areas of the army in which officers are commissioned or appointed (in the case of warrant officers) and indicate an officer's broad specialty area. (For example, Infantry, Signal Corps, and Adjutant General's Corps.) Generally, officers are assigned to sequential positions of increasing responsibility and authority within one of the three functional categories of the army branches (Maneuver, Fires and Effects; Operations Support; Force Sustainment) to develop their leadership and managerial skills to prepare them for higher levels of command. The branches themselves are administrative vice operational command structures that are primarily involved with training, doctrine, and manpower concerns. Each branch has a Branch Chief who is the Head of the Branch and usually serves as the respective branch school commandant or director.
Special branches - contain those groupings of military occupational specialties (MOS) of the army in which officers are commissioned or appointed after completing advanced training and education and/or receiving professional certification in one of the classic professions (i.e., theology, law, or medicine), or other associated health care areas (e.g., dentistry, veterinary medicine, pharmacy, registered nurse, physician's assistant). Officers of most special branches are restricted to command of units and activities of their respective department/branch only, regardless of rank or seniority. This means, for example, that Army Medical Department (AMEDD) branch officers may only command AMEDD units and activities. Likewise, Chaplains are essentially "officers without command" and are ineligible to command operational units and activities. They do, however, supervise junior ranking chaplains and enlisted chaplain's assistants. As an exception to this general rule, JAG Corps officers are eligible to command and may be assigned (with permission from the Judge Advocate General) to non-legal command positions, although ordinarily, like other Special branch officers, a JAG officer will only lead JAG Corps units and activities during their career. [47]
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Each branch of the army has a different branch insignia. Per US Army Pamphlet 600-3, dated 1 February 2010, the three functional categories and associated functional groups for the branches and associated functional areas are: [50]
Ten companies of riflemen were authorized by a resolution of the Continental Congress on 14 June 1775. However, the oldest Regular Army infantry regiment, the 3rd Infantry Regiment, was constituted on 3 June 1784, as the First American Regiment.
The Armor Branch traces its origin to the Cavalry.
A regiment of cavalry was authorized to be raised by the Continental Congress Resolve of 12 December 1776. Although mounted units were raised at various times after the Revolution, the first in continuous service was the United States Regiment of Dragoons, organized in 1833. The Tank Service was formed on 5 March 1918. The Armored Force was formed on 10 July 1940. Armor became a permanent branch of the army in 1950.
Following the establishment of the U.S. Air Force as a separate service in 1947, the army began to develop further its own aviation assets (light planes and rotary wing aircraft) in support of ground operations. The Korean War gave this drive impetus, and the war in Vietnam saw its fruition, as army aviation units performed a variety of missions, including reconnaissance, transport, and fire support. After the war in Vietnam, the role of armed helicopters as tank destroyers received new emphasis. In recognition of the growing importance of aviation in army doctrine and operations, aviation became a separate branch on 12 April 1983.
The Continental Congress unanimously elected Henry Knox "Colonel of the Regiment of Artillery" on 17 November 1775. The regiment formally entered service on 1 January 1776.
The Air Defense Artillery branch descended from the Anti-Aircraft Artillery (part of the U.S. Army Coast Artillery Corps) into a separate branch on 20 June 1968.
Continental Congress authority for a "Chief Engineer for the Army" dates from 16 June 1775. A corps of engineers for the United States was authorized by the Congress on 11 March 1789. The Corps of Engineers as it is known today came into being on 16 March 1802, when the President was authorized to "organize and establish a Corps of Engineers ... that the said Corps ... shall be stationed at West Point in the State of New York and shall constitute a Military Academy." A Corps of Topographical Engineers, authorized on 4 July 1838, was merged with the Corps of Engineers in March 1863.
The Chemical Warfare Service was established on 28 June 1918, combining activities that until then had been dispersed among five separate agencies of government. It was made a permanent branch of the Regular Army by the National Defense Act of 1920. In 1945, it was re-designated the Chemical Corps.
A Provost Marshal General's Office and Corps of Military Police were established in 1941. Prior to that time, except during the Civil War and World War I, there was no regularly appointed Provost Marshal General or regularly constituted Military Police Corps, although a "Provost Marshal" can be found as early as January 1776, and a "Provost Corps" as early as 1778.
The first special forces unit in the Army was formed on 11 June 1952, when the 10th Special Forces Group was activated at Fort Bragg, North Carolina. A major expansion of special forces occurred during the 1960s, with a total of eighteen groups organized in the Regular Army, Army Reserve, and Army National Guard. As a result of renewed emphasis on special operations in the 1980s, the Special Forces Branch was established as a basic branch of the army effective 9 April 1987, by General Order No. 35, 19 June 1987. Special forces are part of U.S. special operations forces
Established as a basic branch effective 16 October 2006 per General Order 30, 12 January 2007.
The Civil Affairs/Military Government Branch in the Army Reserve Branch was established as a special branch on 17 August 1955. It was subsequently redesignated the Civil Affairs Branch on 2 October 1955, and it has continued its mission to provide guidance to commanders in a broad spectrum of activities ranging from host–guest relationships to the assumption of executive, legislative, and judicial processes in occupied or liberated areas. Became a basic branch effective 16 October 2006 per General Order 29, on 12 January 2007.
The Signal Corps was authorized as a separate branch of the army by act of Congress on 3 March 1863. However, the Signal Corps dates its existence from 21 June 1860, when Congress authorized the appointment of one signal officer in the army, and a War Department order carried the following assignment: "Signal Department – Assistant Surgeon Albert J. Myer to be Signal Officer, with the rank of Major, 27 June 1860, to fill an original vacancy."
Intelligence has been an essential element of army operations during war as well as during periods of peace. In the past, requirements were met by personnel from the Army Intelligence and Army Security Reserve branches, two-year obligated tour officers, one-tour levies on the various branches, and Regular Army officers in the specialization programs. To meet the army's increased requirement for national and tactical intelligence, an Intelligence and Security Branch was established effective 1 July 1962, by General Order No. 38, on 3 July 1962. On 1 July 1967, the branch was re-designated as Military Intelligence.
The Quartermaster Corps, originally designated the Quartermaster Department, was established on 16 June 1775. While numerous additions, deletions, and changes of function have occurred, its basic supply and service support functions have continued in existence.
The Ordnance Department was established by act of Congress on 14 May 1812. During the Revolutionary War, ordnance material was under supervision of the Board of War and Ordnance. Numerous shifts in duties and responsibilities have occurred in the Ordnance Corps since colonial times. It acquired its present designation in 1950. Ordnance soldiers and officers provide maintenance and ammunition support.
The history of the Transportation Corps starts with World War I. Prior to that time, transportation operations were chiefly the responsibility of the Quartermaster General. The Transportation Corps, essentially in its present form, was organized on 31 July 1942. The Transportation Corps is headquartered at Fort Lee, Virginia. [51]
Established by General Order 6, 27 November 2007. Consists of multifunctional logistics officers in the rank of captain and above, drawn from the Ordnance, Quartermaster and Transportation Corps.
The post of Adjutant General was established 16 June 1775, and has been continuously in operation since that time. The Adjutant General's Department, by that name, was established by the act of 3 March 1812, and was re-designated the Adjutant General's Corps in 1950.
The Finance Corps is the successor to the old Pay Department, which was created in June 1775. The Finance Department was created by law on 1 July 1920. It became the Finance Corps in 1950.
The Army Medical Department and the Medical Corps trace their origins to 27 July 1775, when the Continental Congress established the army hospital headed by a "Director General and Chief Physician." Congress provided a medical organization of the army only in time of war or emergency until 1818, which marked the inception of a permanent and continuous Medical Department. The Army Organization Act of 1950 renamed the Medical Department as the Army Medical Service. In June 1968, the Army Medical Service was re-designated the Army Medical Department. The Medical Department has the following branches:
The legal origin of the Chaplain Corps is found in a resolution of the Continental Congress, adopted 29 July 1775, which made provision for the pay of chaplains. The Office of the Chief of Chaplains was created by the National Defense Act of 1920.
The Office of Judge Advocate General of the Army is deemed to have been created on 29 July 1775, the date of appointment of Colonel William Tudor as the first U.S. Army Judge Advocate General. [52] The history of the branch has generally paralleled the origin and development of the American system of military justice. The Judge Advocate General Department, by that name, was established in 1884. Its present designation as a corps was enacted in 1948.
A division is a large military unit or formation, usually consisting of between 10,000 and 25,000 soldiers. In most armies, a division is composed of several regiments or brigades; in turn, several divisions typically make up a corps.
The 3rd Infantry Division (3ID) is a combined arms division of the United States Army based at Fort Stewart, Georgia. It is a subordinate unit of the XVIII Airborne Corps under U.S. Army Forces Command. Its current organization includes a division headquarters and headquarters battalion, two armored brigade combat teams, one aviation brigade, a division artillery, a sustainment brigade and a combat sustainment support battalion along with a maneuver enhancement brigade. The division has a distinguished history, having seen active service in World War I, World War II, the Korean War, and the Global War on Terror. The Medal of Honor has been awarded to 61 members of the 3rd Infantry Division, making the division the most honored in the Army.
A brigade is a major tactical military formation that typically comprises three to six battalions plus supporting elements. It is roughly equivalent to an enlarged or reinforced regiment. Two or more brigades may constitute a division.
The 2nd Infantry Division ("Indianhead") is a formation of the United States Army. Since the 1960s, its primary mission has been the pre-emptive defense of South Korea in the event of an invasion from North Korea. Approximately 17,000 soldiers serve in the 2nd Infantry Division, with 10,000 stationed in South Korea, accounting for about 35% of the United States Forces Korea personnel. Known as the 2nd Infantry Division-ROK/U.S. Combined Division (2ID/RUCD), the division is bolstered by rotational Brigade Combat Teams (BCTs) from other U.S. Army divisions.
The 1st Infantry Division (1ID) is a combined arms division of the United States Army, and is the oldest continuously serving division in the Regular Army. It has seen continuous service since its organization in 1917 during World War I. It was officially nicknamed "The Big Red One" after its shoulder patch and is also nicknamed "The Fighting First". The division has also received troop monikers of "The Big Dead One" and "The Bloody First" as puns on the respective officially sanctioned nicknames. It is currently based at Fort Riley, Kansas.
The 5th Infantry Division (Mechanized)—nicknamed the "Red Diamond", or the "Red Devils" —was an infantry division of the United States Army that served in World War I, World War II and the Vietnam War, and with NATO and the U.S. Army III Corps. It was deactivated on 24 November 1992 and reflagged as the 2nd Armored Division.
The 104th Infantry Division was an infantry division of the United States Army. Today, it is known as the 104th Training Division (Leader Training) and based at Fort Lewis, Washington, as a training unit of the United States Army Reserve.
The 91st Infantry Division (famously nicknamed as the "Wild West Division" with a "Fir Tree" as its Division insignia to symbolize its traditional home of the Far West) is an infantry division of the United States Army that fought in World War I and World War II. From 1946 until 2008, it was part of the United States Army Reserve. It was briefly inactivated from 2008 until 2010 when it was elevated back to a division size element as the 91st Training Division (Operations).
The 29th Infantry Division, also known as the "Blue and Gray Division", is an infantry division of the United States Army based at Fort Belvoir in Fairfax County, Virginia. The division is currently a formation of the Army National Guard and includes units from Virginia, Maryland, Kentucky, North Carolina, South Carolina, and West Virginia.
The 89th Infantry Division, originally known as the "89th Division," was an infantry formation of the United States Army that was active during World War I, World War II, and the Cold War.
The 100th Training Division (Leader Development) (formerly the 100th Infantry Division) is a division of the United States Army headquartered at Fort Knox, Kentucky. It currently serves as a major training command of the United States Army Reserve. It has been known as the "Century Division" owing to its "100th" designation.
The 79th Infantry Division was an infantry formation of the United States Army Reserve in World Wars I and II.
The 81st Readiness Division ("Wildcat") was a formation of the United States Army originally organized as the 81st Infantry Division during World War I. After World War I, the 81st Division was allotted to the Organized Reserve as a "skeletonized" cadre division. In 1942, the division was reactivated and reorganized as the 81st Infantry Division and served in the Pacific during World War II. After World War II, the 81st Infantry Division was allotted to the Organized Reserve as a Class C cadre division, and stationed at Atlanta, Georgia. The 81st Infantry Division saw no active service during the Cold War and was inactivated in 1965.
The 94th Division was a unit of the United States Army in World War I, and of the Organized Reserve Corps in 1921 until 1942.
The 76th Infantry Division was a unit of the United States Army in World War I, World War II and the Cold War. The division was inactivated in 1996 and has been reconstituted as the 76th US Army Reserve Operational Response Command in 2013.
The 85th Infantry Division also known as "Custer Division" was an infantry division of the United States Army in World War I and World War II. It currently exists as the 85th Support Command.
The United States Army Forces Command (FORSCOM) is the largest United States Army command. It provides land forces to the Department of Defense's (DOD) unified combatant commands. Headquartered at Fort Liberty, North Carolina, FORSCOM consists of more than 750,000 active Army, U.S. Army Reserve, and Army National Guard soldiers. It was created on 1 July 1973 from the former Continental Army Command, which in turn supplanted Army Field Forces and Army Ground Forces.
The Philippine Army (PA) is the main, oldest and largest branch of the Armed Forces of the Philippines (AFP), responsible for ground warfare and as of 2021 had an estimated strength of 143,100 soldiers The service branch was established on December 21, 1935, as the Philippine Commonwealth Army. The Philippine Army has engaged in many conflicts including the ongoing Communist rebellion in the Philippines, the Moro conflict and, alongside other national military forces, in conflicts of international scope.
In the United States (US) military, a beret flash is a shield-shaped embroidered cloth that is typically 2.25 in (5.72 cm) tall and 1.875 in (4.76 cm) wide with a semi–circular base that is attached to a stiffener backing of a military beret. These flashes—a British English word for a colorful cloth patch attached to military headgear—are worn over the left eye with the excess cloth of the beret shaped, folded, and pulled over the right ear giving it a distinctive appearance.
The United States Army Alaska was a military command of the United States Army located in the U.S. state of Alaska. A subordinate command of I Corps, USARAK was the ground element of the Alaskan Command. USARAK was headquartered at Joint Base Elmendorf-Richardson and commanded by a major general. USARAK was reflagged as the 11th Airborne Division on June 6, 2022.