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Reserve components of the United States Armed Forces

The reserve components of the United States Armed Forces are military organizations whose members generally perform a minimum of 39 days of military duty per year and who augment the active duty (or full-time) military when necessary. The reserve components are also referred to collectively as the National Guard and Reserve.[1][2]

According to 10 U.S.C. § 10102, "the purpose of each reserve component is to provide trained units and qualified persons available for active duty in the armed forces, in time of war or national emergency, and at such other times as the national security may require, to fill the needs of the armed forces whenever, during and after the period needed to procure and train additional units and qualified persons to achieve the planned mobilization, more units and persons are needed than are in the regular components."

General information[edit]

The reserve components are the embodiment of the American tradition of the citizen-soldier dating back to before the American Revolutionary War. They are typically, but not always, regionally based and recruited (unlike their active duty counterparts) and, in the case of the Army and Air National Guard, are the organized state militias referred to in the U.S. Constitution.


Members of the reserve components are generally required to perform, at a minimum, 39 days of military service per year. This includes monthly drill weekends and fifteen days of annual training (giving rise to the old slogan "one weekend a month, two weeks a year"). However, many members of the reserve components will perform well in excess of this amount, often in the realm of 120 to 179 days of combined drill duty and active duty per year. Personnel in this latter category are typically assigned to specialized combat units in the reserve components that require additional duty in order to maintain proficiency, such as pilots, flight officers and enlisted aircrewmen in flying units or special operations forces personnel (e.g., Army Special Forces, Navy SEALs, etc.) in SOF units.


While organized, trained, and equipped nearly the same as the active duty, the reserve components often have unique characteristics. This is especially true of the National Guard, which performs both federal and state missions. In addition, reserve components often operate under special laws, regulations, and policies.

Reserve vs. National Guard[edit]

The Reserve Components of the United States Armed forces are named within Title 10 of the United States Code and include: (1) the Army National Guard, (2) the Army Reserve, (3) the Navy Reserve, (4) the Marine Corps Reserve, (5) the Air National Guard, (6) the Air Force Reserve, and (7) the Coast Guard Reserve. In practice the use of the term "reserve" varies depending on the context in which it is used. In one context, as used here in this article, it applies to all seven of the reserve components of the U.S. military. In another context, it applies to only the five reserve components directly associated with the five active duty military services but neither to the Army National Guard nor the Air National Guard.


In most respects, the Army National Guard and Air National Guard are very similar to the Army Reserve and Air Force Reserve, respectively. The primary difference lies in the level of government to which they are subordinated. The Army Reserve and Air Force Reserve are subordinated to the federal government while the National Guards are subordinated to the various state governments, except when called into federal service by the President of the United States or as provided for by law. For example, the California Army National Guard and California Air National Guard are subordinated to the state of California and report to the governor of California as their commander-in-chief.


This unique relationship descends from the colonial and state militias that served as a balance against a standing federal army, which many Americans feared would threaten states' rights. The portions of each state's militia subject to federal activation were organized into the present National Guard system with the Militia Act of 1903. The portions of a state's government sponsored militia that remain, if any, are the State Defense Force for that state.


Besides the theoretical check on federal power, the distinction between the federal military reserves and the National Guard permits state governors to use their personnel to assist in disaster relief and to preserve law and order in times of crisis. The latter is permitted because the National Guard are not subject to the restrictions of the Posse Comitatus Act unless they are under federal jurisdiction. The restrictions, however, do apply to the four of the other five reserve components just as it does with their active duty military counterparts.

Militia and Reserve[edit]

While the National Guard is a militia force organized by each state,[3][4] it is also a reserve federal military force of the United States Armed Forces.[3][4] The National Guard is joint reserve component of the United States Army and the United States Air Force and are made up of National Guard members from the states appointed to federal military service[3] under the consent of their respective state governors.[5][6][7] The National Guard maintains two subcomponents: the Army National Guard[3] for the Army and the Air Force's Air National Guard.[3]

Ready Reserve

Standby Reserve

The Retired Reserve consists of all Reserve officers and enlisted personnel who receive retired pay on the basis of active duty or reserve service; all Reserve officers and enlisted personnel who are otherwise eligible for retired pay but have not reached age sixty, who have not elected discharge, and are not voluntary members of the Ready or Standby Reserve; and other retired reservists under certain conditions.

All members of a reserve component are assigned to one of three reserve component categories:

Full Mobilization (10 USC 12301(a)) requires a declaration of war or national emergency by the , affects all reservists (including those on inactive status and retired reserve members), and may last until six months after the war or emergency for which it was declared.

United States Congress

Partial Mobilization (10 USC 12302) requires a declaration of national emergency, affects only the Ready Reserve, and is limited to a maximum of one million personnel activated for no more than two years.

Presidential Reserve Call-Ups (10 USC 12304) do not require a declaration of national emergency but do require the President to notify Congress, and is limited to 200,000 Selected Reservists and 30,000 Individual Ready Reservists for up to 270 days.

Military Reserve Emergency Activation (10 USC 12304a) allows the SecDef to activate the Ready Reserves (minus the Guard) in response to major disasters or emergencies for up to 120 days.

Combatant Commander Preplanned Missions (10 USC 12304b) allows individual service secretaries to augment the active forces for preplanned missions in support of the combatant commands for up to 365 consecutive days and is limited to 60,000 Selected Reservists.

The 15-Day Statute (10 USC 12301(b)) allows individual service secretaries to call up the Ready Reserves for up to 15 days per year for annual training or operational missions.

RC Volunteers (10 USC 12301(d)) may voluntarily request to go on active duty regardless of their reserve component category, but state governors must approve activating National Guard personnel.

Retired Reservists with 20 or more years of active duty are subject to involuntary recall by the President under 10 USC 688.

Individual service members, portions of units, or entire units of the reserve components may be called into active duty (also referred to as mobilized, activated, or called up), under several conditions:


Note: while Regular Component (or commonly called Active Component [AC]) retirees are part of the Total Force of available manpower if needed, they remain part of the AC for life, whether retired for disability or longevity, carried on their Service's AC Retired List in a reduced state of readiness. It is generally easier to recall a retired AC member using 10 USC 688 authority than recalling a Retired Reservist (with less than 20 years of active duty) using any of the 10 USC 123XX mobilization authorities.

Ready Reserve Corps of the U.S. Public Health Service

Military reserve force

(WBIL)

World Basic Information Library

Angelo, M. (1996). (ed.). Reserve Components of the United States Armed Forces (pdf). p. 83. Archived (PDF) from the original on March 25, 2020..

United States Department of Defense

Title 10, Subtitle E of the United States Code

Reserve Component Categories of the Armed Forces

Reserve Officers Association

United States Air Force Reserve

United States Army Reserve

United States Marine Reserve

United States Navy Reserve

United States Coast Guard Reserve