United States Armed Forces

The **United States Armed Forces** are the military forces of the United States. The armed forces consists of six service branches: the Army, Marine Corps, Navy, Air Force, Space Force, and Coast Guard. All six armed services are among the eight uniformed services of the United States.

Each of the different military services is assigned a role and domain. The U.S. Army conducts land operations, while the U.S. Navy and U.S. Marine Corps conduct maritime operations, with the Marine Corps specializing in amphibious and maritime littoral operations in support of the Navy. The U.S. Air Force conducts air operations, while the U.S. Space Force conducts space operations. The U.S. Coast Guard is unique in that it is a military branch specializing in maritime operations and also a law enforcement agency.

From their inception during the American Revolutionary War, the U.S. Armed Forces have played a decisive role in the history of the United States. They helped forge a sense of national unity and identity through victories in the First Barbary War and the Second Barbary War. They played a critical role in the territorial evolution of the United States, including the American Civil War. The National Security Act of 1947, adopted following World War II, created the modern U.S. military framework. The Act established the National Military Establishment, headed by the secretary of defense; and created the United States Air Force and the National Security Council. It was amended in 1949, renaming the National Military Establishment the Department of Defense, and merged the cabinet-level Department of the Army, Department of the Navy, and Department of the Air Force, into the Department of Defense.

The president of the United States is the commander-in-chief of the armed forces and forms military policy with the Department of Defense (DoD) and Department of Homeland Security (DHS), both federal executive departments, acting as the principal organs by which military policy is carried out.

The U.S. Armed Forces are one of the largest military forces in terms of personnel. They draw their personnel from a large pool of professional volunteers. Although military conscription has been used in the past, it has not been used in the U.S. since 1973. The Selective Service System retains the power to conscript males, and requires that all male citizens and residents residing in the U.S. between the ages of 18–25 register with the service.

The U.S. Armed Forces are considered the world's most powerful military. The military budget of the United States was US$693 billion in 2019, the highest in the world. In 2018, that accounted for 36 percent of the world's defense expenditures. The U.S. Armed Forces has significant capabilities in both defense and power projection due to its large budget, resulting in advanced and powerful technologies which enables a widespread deployment of the force around the world, including around 800 military bases outside the United States. The U.S. Air Force is the world's largest air force, while the U.S. Army Aviation Branch is the second largest. The U.S. Naval Air Forces is the fourth largest air arm in the world and is the largest naval aviation service, while U.S. Marine Corps Aviation is the world's seventh largest air arm. The U.S. Navy is the world's largest navy by tonnage. The U.S. Coast Guard is the world's 12th largest maritime force. The U.S. Space Force is the world's only active independent space force.

## History

Main articles: Military history of the United States, History of the Army, Marine Corps, Navy, Air Force, Space Force, and Coast Guard

The history of the U.S. Armed Forces dates back to 14 June 1775, with the creation of the Continental Army, even before the Declaration of Independence marked the establishment of the United States. The Continental Navy, established on 13 October 1775, and Continental Marines, established on 10 November 1775, were created in close succession by the Second Continental Congress in order to defend the new nation against the British Empire in the American Revolutionary War.

These forces demobilized in 1784 after the Treaty of Paris ended the Revolutionary War. The Congress of the Confederation created the current United States Army on 3 June 1784. The United States Congress created the current United States Navy on 27 March 1794 and the current United States Marine Corps on 11 July 1798. All three services trace their origins to their respective Continental predecessors. The 1787 adoption of the Constitution gave Congress the power to "raise and support armies", to "provide and maintain a navy" and to "make rules for the government and regulation of the land and naval forces", as well as the power to declare war. The President of the United States is the U.S. Armed Forces' commander-in-chief.

The United States Coast Guard traces its origin to the formation of the Revenue Cutter Service on 4 August 1790, which merged with the United States Life-Saving Service on 28 January 1915 to establish the Coast Guard. The United States Air Force was established as an independent service on 18 September 1947; it traces its origin to the formation of the Aeronautical Division, U.S. Signal Corps, which was formed 1 August 1907 and was part of the Army Air Forces before being recognized as an independent service in the National Security Act of 1947. The United States Public Health Service Commissioned Corps was formerly considered to be a branch of the United States Armed Forces from 29 July 1945 until 3 July 1952, and is now one of the eight uniformed services of the United States

The United States Space Force was established as an independent service on 20 December 2019. It is the sixth branch of the U.S. military and the first new branch in 72 years. The origin of the Space Force can be traced back to the Air Force Space Command, which was formed 1 September 1982 and was a major command of the United States Air Force.

## Structure

Presidential command over the U.S. Armed Forces is established in Article II in the Constitution whereby the president is named as the "Commander in Chief of the Army and Navy of the United States, and of the Militia of the several States, when called into the actual Service of the United States." The United States Armed Forces are split between two cabinet departments, with the Department of Defense serving as the primary cabinet department for military affairs and the Department of Homeland Security responsible for administering the United States Coast Guard.

The military chain of command flows from the President of the United States to the secretary of defense (for services under the Defense Department) or secretary of homeland security (for services under the Department of Homeland Security), ensuring civilian control of the military. Within the Department of Defense, the military departments (Department of the Army, United States Department of the Navy, and Department of the Air Force) are civilian led entities that oversee the coequal military service branches organized within each department. The military departments and services are responsible for organizing, training, and equipping forces, with the actual chain of command flowing through the unified combatant commands.

The Joint Chiefs of Staff, although outside the operational chain of command, is the senior-most military body in the United States Armed Forces. It is led by the Chairman of the Joint Chiefs of Staff, who is the military head of the armed forces and principal advisor to the president and secretary of defense on military matters. Their deputy is the Vice Chairman of the Joint Chiefs of Staff. Other members include the chief of staff of the Army, commandant of the Marine Corps, chief of naval operations, chief of staff of the Air Force, chief of space operations, and the chief of the National Guard Bureau. The commandant of the Coast Guard is not an official member of the Joint Chiefs, but sometimes attends meetings as the one of the military service chiefs. The Senior Enlisted Advisor to the Chairman is the most senior enlisted member in the United States Armed Forces.

Leadership of the Armed Forces, to include the president of the United States, Secretary of Defense, Secretary of Homeland Security and Chairman of the Joint Chiefs of Staff are members of the United States National Security Council, which advises the president on national security, military, and foreign policy matters. The National Security Advisor, Homeland Security Advisor, and the Deputy National Security Advisor may also be members of the United States Armed Forces. The National Security Council Deputies Committee also includes the Deputy Secretary of Defense, Deputy Secretary of Homeland Security, and Vice Chairman of the Joint Chiefs of Staff. Military leadership, including the Secretary of Defense, United States Secretary of Homeland Security, and Chairman of the Joint Chiefs of Staff also sit on the National Space Council.

### Unified combatant commands

Main article: Unified combatant command

Unified combatant commands are joint military commands consisting of forces from multiple military departments, with their chain of command flowing from the president, to the secretary of defense, to the commanders of the combatant commands. Each service organizes, trains, and equips forces that are then presented to the unified combatant commands through service component commands. Special Operations Command and Cyber Command also present theater special operations commands or joint force headquarters – cyber to other combatant commanders. Army components are typically dual-hatted as the joint force land component, Navy components are typically dual-hatted as the joint force maritime component, and Air Force components are typically dual-hatted as the joint force air component, with the theater special operations command dual-hatted as the joint force special operations component, and Space Force component typically dual-hatted as the joint force space component.

### Combat support agencies

Main article: combat support agency

Combat support agencies are Department of Defense agencies that have a combat support mission, involving providing support for operating forces engaged in planning for, or conducting, military operations, including support during conflict or in the conduct of other military activities related to countering threats to U.S. national security. This mission is focused on providing support to echelons at the CCMD level and below and may not encompass the full scope of the CSA's mission.

## Service branches

The United States Armed Forces is composed of six coequal military service branches. Five of the branches, the United States Army, United States Marine Corps, United States Navy, United States Air Force, and United States Space Force are organized under the Department of Defense's military departments. The United States Coast Guard is nominally under the Department of Homeland Security, but may be transferred to the Department of Defense's Department of the Navy (which is the civilian entity that oversees the coequal U.S. Marine Corps and U.S. Navy) at the direction of the president or congress. With the exception of the Coast Guard, the military services only organize, train, and equip forces. The unified combatant commands are responsible for operational control of non-service retained forces.

Each of the different military services is assigned a role and domain. The U.S. Army conducts land operations, while the U.S. Navy and U.S. Marine Corps conduct maritime operations, with the Marine Corps specializing in amphibious and maritime littoral opeations in support of the Navy. The U.S. Air Force conducts air operations, while the U.S. Space Force conducts space operations. The U.S. Coast Guard is unique in that it is a military branch specializing in maritime operations and also a law enforcement agency.

### U.S. Army

Main article: United States Army

The United States Army (USA) is the United States Armed Forces' land force and is the largest and oldest service. Originally established in 1775 as the Continental Army, it consists of one million soldiers across the Regular Army, Army Reserve, and Army National Guard. The Army serves as the Armed Forces principal land service, responsible for conducting land warfare operations.

The U.S. Army is organized under the Department of the Army, which is a military department under the leadership of the secretary of the Army and under secretary of the Army. The U.S. Army itself is led by the chief of staff of the Army and vice chief of staff of the Army, both generals who are advised by the sergeant major of the Army.

The Army's primary responsibility is to conduct prompt and sustained land combat as part of the joint force. Army landpower focuses on destroying an enemy's armed forces, occupying its territory, and breaking the will of an adversary.

The five core competencies of the Army are:

* Prompt and sustained land combat
* Combined arms operations:
	+ Combined arms maneuver and wide area security
	+ Armored and mechanized operations
	+ Airborne and air assault operations
* Special operations
* Set and sustain the theater for the joint force
* Integrate national, multinational, and joint power on land

The thirteen specified functions of the Army are:

1. Conduct prompt and sustained combined arms combat operations on land in all environments and types of terrain, to include complex urban environments, in order to defeat enemy ground forces, and seize, occupy, and defend land areas.
2. Conduct air and missile defense to support joint campaigns and assist in achieving air superiority. This is conducted by the Army's Air Defense Artillery Branch, specifically by the 10th Army Air and Missile Defense Command, 32nd Army Air and Missile Defense Command, 94th Army Air and Missile Defense Command, 263rd Army Air and Missile Defense Command, and Army Space and Missile Defense Command.
3. Conduct airborne and air assault, and amphibious operations. The Army has primary responsibility for the development of airborne doctrine, tactics, techniques, and procedures. Army airborne and air assault operations are conducted by the XVIII Airborne Corps, 11th Airborne Division, 82nd Airborne Division, 101st Airborne Division, and the 173rd Airborne Brigade.
4. Conduct civil affairs operations. Civil affairs operations are conducted by the United States Army Special Operations Command, predominantly under United States Army Civil Affairs and Psychological Operations Command and the 95th Civil Affairs Brigade.
5. Conduct riverine operaitons.
6. Occupy territories abroad and provide for the initial establishment of a military government pending transfer of this responsibility to other authorities.
7. Interdict enemy sea power, space power, air power, and communications through operations on and from the land.
8. Provide logistics to joint operations and campaigns, including joint over-the-shore and intra-theater transport of time-sensitive, mission-critical personnel and materiel. This is primarily conducted through the Army Logistics Branch, including the Quartermaster Corps, Ordnance Corps, Transportation Corps, and through Army Materiel Command's Military Surface Deployment and Distribution Command.
9. Provide support to space operations to enhance joint campaigns, in coordination with the other military services (primarily the United States Space Force), combatant commands (primarily United States Space Command), and other U.S. government departments and agencies. Army space operations are conducted by Army Space and Missile Defense Command.
10. Conduct authorized civil works programs, to include projects for the improvement of navigation, flood control, beach erosion control, and other water resource developments in the United States, its territories, and its possessions, and conduct other civil activities prescribed by law. These are conducted by the Army Corps of Engineers.
11. Provide intra-theater aeromedical evacuation. These missions are flown by the Army Medical Service Corps and Army Aviation Branch.
12. Conduct reconnaissance, surveillance, and target acquisition.
13. Operate land lines of communication. This is primarily conducted through the Transportation Corps and Military Surface Deployment and Distribution Command.

#### Infantry

Main article: Infantry Branch (United States)

The Infantry Branch forms the core of the service's land combat power. U.S. Army infantry are generally equipped with the M4 carbine and M249 light machine gun, which will be replaced by the XM7 rifle and XM250.

Infantry is a core part of the Army's Brigade Combat Teams. The most numerous variant, the Infantry Brigade Combat Team, comprise light infantry battalions who fight on foot. Infantry Brigade Combat Teams of the 82nd Airborne Division are air assault capable, with infantry soldiers being transported by U.S. Army Aviation UH-60 Black Hawk and CH-47 Chinook helicopters. Infantry Brigade Combat Teams of the 11th Airborne Division, 82nd Airborne Division, and 173rd Airborne Brigade are capable of airborne operations, in cooperation with the U.S. Air Force's transport aircraft. Finally, Infantry Brigade Combat Teams assigned to the 10th Mountain Division specialized in mountain warfare. Standard Infantry Brigade Combat Teams are assigned to the 25th Infantry Division, which offers additional training in jungle warfare.

Armored Brigade Combat Teams comprise mechanized infantry battalions mounted in the M2 Bradley infantry fighting vehicle. Divisions with Armored Brigade Combat Teams include the 1st Infantry Division, 3rd Infantry Division, 4th Infantry Division, 1st Armored Division, and 1st Cavalry Division. Stryker Brigade Combat Teams are centered around Stryker infantry battalions operating out of the Stryker. Divisions with Stryker Brigade Combat Teams include the 2nd Infantry Division, 4th Infantry Division, 11th Airborne Division, 2nd Cavalry Regiment, and 3rd Cavalry Regiment.

United States Army Rangers with the 75th Ranger Regiment are an elite special operations infantry force in United States Army Special Operations Command, specializing in air assault and airborne infiltration methods. The three primary missions of the 75th Ranger Regiment are special operations raids, forcible entry operations, such as an airfield seizure to enable the Air Force to bring in more forces, and special reconnaissance. As a special operations force, Army Rangers are generally better equipped than standard infantry, utilizing the FN SCAR rifle.

#### Army Special Forces

Main article: United States Army Special Forces

Army Special Forces, commonly known as Green Berets after their iconic headgear, are among the most elite soldiers in the Army. Special Forces conduct unconventional warfare, enabling a resistance movement or insurgency to coerce, disrupt, or overthrow a government or occupying power by operating through or with an underground force in a denied area, foreign internal defense, training and equipping foreign allied military forces to defend against insurgency, subversion, terrorism, and other security threats, and security force assistance, training and developing the defense capabilities of friendly and developing nations. More direct missions include counterinsurgency, direct action, and special reconnaissance in hostile, denied, or diplomatically or politically sensitive environments, to collect or verify information of strategic significance. Special Forces are trained military free-fall parachuting and combat diver skillsets. Army Special Forces are considered the most versatile special operations force in the entire world, operating as a multi-purpose force since 1952.

#### Armor and Cavalry

Main article: Armor Branch

The Armor Branch traces its history back to the United States Cavalry, and are responsible for tank and cavalry reconnaissance operations.

The U.S. Army fields the M1 Abrams main battle tank in Armored Battalions as part of Armored Brigade Combat Teams across the 1st Armored Division, 1st Cavalry Division, 1st Infantry Division, 3rd Infantry Division, and the 4th Infantry Division. Each Armored Brigade Combat Team also possesses a cavalry squadron equipped with M2 Bradleys for scouting and security. Styker Brigade Combat Teams from the 2nd Infantry Division, 4th Infantry Division, 11th Airborne Division, 2nd Cavlary Regiment, and 3rd Cavalry Regiment have a cavalry squadron equipped with Strykers. Infantry Brigade Combat Teams from the 10th Mountain Division, 11th Airborne Division, 25th Infantry Division, 82nd Airborne Division, 101st Airborne Division, and 173rd Airborne Brigade have a cavalry squadron equipped with the Joint Light Tactical Vehicle.

#### Field Artillery

Main article: Field Artillery Branch (United States)

The Field Artillery's mission is to destroy, suppress or neutralize the enemy by cannon, rocket or missile fire. Rocket systems include the M142 HIMARS and M270 Multiple Launch Rocket System, which are corps-level asset found in field artillery brigades. Towed artillery includes the M119 howitzer in Infantry Brigade Combat Teams and the M777 howitzer found in both Infantry and Stryker Brigade Combat Teams. The M109 self-propelled howitzer is utilized in Armored Brigade Combat Teams.

During the Cold War, Army field artillery was responsible for the service's ballistic missile programs, including the PGM-11 Redstone, which was the first large ballistic missile in the U.S. arsenal, the MGM-31 Pershing, and the Pershing II. In 2023, the Army is intending to field the Long-Range Hypersonic Weapon and has reestablished larger artillery formations like the 56th Artillery Command.

#### Air Defense Artillery

Main article: Air Defense Artillery Branch

The Air Defense Artillery is responsible for defending geopolitical assets and providing maneuver forces with the freedom to move on the battlefield by deterring the enemy and destroying aerial threats, missile attacks, and surveillance platforms. Weapons employed by Air Defense Artillery include the FIM-92 Stinger man-portable air-defense system, AN/TWQ-1 Avenger, for short range air defense, and the counter rocket, artillery, and mortar 20mm gun system. The Iron Dome provides air defense against rockets, artillery, mortars, missiles, and unmanned aerial vehicles, while the MIM-104 Patriot is capable of defeating a wide range of threats including aircraft, helicopters, UAVs, ballistic and cruise missiles, and Weapons of Mass Destruction.

The Terminal High Altitude Area Defense protects strategic critical assets by conducting long-range endo-and-exo-atmospheric engagements of ballistic missiles using the world's largest air-transportable X-band radar. The Ground-Based Midcourse Defense is an anti-ballistic missile system operated by Army Space and Missile Defense Command to defend the United States homeland against an intercontinental ballistic missile attack. Major Air Defense Artillery units include the 32nd Army Air and Missile Defense Command and Army Space and Missile Defense Command's 100th Missile Defense Brigade.

Air Defense Artillery has an extremely close relationship with the Air Force through its Air and Missile Defense Commands and the Space Force through Army Space and Missile Defense Command, given their shared missile defense and space roles. In 1962, Air Defense Artillery achieved the first intercept of a ballistic missile with a nuclear-tipped Nike Zeus and operated the Nike Zeus as an anti-satellite weapon after completing a successful intercept in 1963.

#### Army Aviation

Main article: United States Army Aviation Branch

Army Aviation, distinct from the U.S. Air Force and its predecessors, began as part of the field artillery in 1942. Small spotter planes were used to spot for artillery and naval bombardment, as well as to perform observation. These few aircraft formed the core of Army Aviation once the U.S. Air Force gained independence. In 1983, the Army created the Aviation Branch, for the first time since the Air Force's independence consolidating aviation under a single organization.

The mission of Army Aviation is to find, fix and destroy any enemy through fire and maneuver and to provide combat support and combat service support in coordinated operations as an integral member of the combined arms team. Major aircraft include the AH-64 Apache, which serves as the Army's attack helicopter, the UH-60 Black Hawk, and the CH-47 Chinook for troop and cargo transport. Army Aviation also flies the MQ-1C Gray Eagle drone.

A specialized unit within Army Aviation, the 160th Special Operations Aviation Regiment (Airborne) serves as a special operations unit and operates modified variants of the MH-60 Black Hawk, MH-47 Chinook, and the MH-6 Little Bird.

#### Army Cyber Corps and Army Signal Corps

Main articles: Cyber Corps (United States Army) and United States Army Signal Corps

Established in 2014, the Army Cyber Corps is responsible for conducting cyberspace operations, electronic warfare, and information operations. The Cyber Corps was created by merging resources from the Army Signal Corps and the Military Intelligence Corps. The Signal Corps is responsible for running the U.S. Army's communications networks.

The Army Signal Corps was previously responsible for operating the Army's payloads on the Wideband Global SATCOM satellite through the 53rd Signal Battalion. In 2022, the Army transferred its mission to the Space Force's 53rd Space Operations Squadron, ending the Signal Corps' space mission.

#### Army commands

The U.S. Army is organized into four major Army Commands, nine Army Service Component Commands, which serve as the Army component and joint force land component commanders for the unified combatant commands, and thirteen direct reporting units.

### U.S. Marine Corps

Main article: United States Marine Corps
24th Marine Expeditionary Unit Marines during a simulated amphibious assault operation
The United States Marine Corps (USMC) serves as the U.S. Armed Forces' naval land force, responsible for executing amphibious warfare and operating in the maritime littorals in support of the U.S. Navy. Originally established in 1775 as the Continental Marines, the Marine Corps consists of the Regular Marine Corps and the Marine Corps Reserve. The Marine Corps maintains a very close relationship with the U.S. Navy, its sister service in the Department of the Navy. Although the Marine Corps has previously operated as an independent land force alongside the Army, its primary purpose is to serve as part of a unified naval service alongside the Navy in the maritime domain.

The U.S. Marine Corps is organized under the Department of the Navy, which is a military department under the leadership of the secretary of the Navy and the under secretary of the Navy. The U.S. Marine Corps itself is led by the commandant of the Marine Corps and the assistant commandant of the Marine Corps, both generals who are advised by the sergeant major of the Marine Corps.

The Marine Corps statutory mission is outlined in 10 U.S.C. § 5063 and as originally introduced under the National Security Act of 1947, with its three primary areas of responsibility including:

* Seizure or defense of advanced naval bases and other land operations to support naval campaigns;
* Development of tactics, technique, and equipment used by amphibious landing forces in coordination with the Army and Air Force; and
* Such other duties as the President or Department of Defense may direct.A 15th Marine Expeditionary Unit AH-1Z Viper flying over the USS *Anchorage* (LPD-23)

The seven specified functions of the Marine Corps are:

1. Seize and defend advanced naval bases or lodgments to facility subsequent joint operations.
2. Provide close air support for ground forces.
3. Conduct land and air operations essential to the prosecution of a naval campaign or as directed.
4. Conduct complex expeditionary operations in the urban littorals and other challenging environments.
5. Conduct amphibious operations, including engagement, crisis response, and power projection operations to assure access. The Marine Corps has primary responsibility for the development of amphibious doctrine, tactics, techniques, and equipment.
6. Conduct security and stability operations and assist with the initial establishment of a military government pending transfer of responsibility to other authorities.
7. Provide security detachments and units for service on armed vessels of the Navy, provide protection of naval property at naval stations and bases, provide security at designated U.S. embassies and consulates, and perform other such duties as the president or secretary of defense may direct. These additional duties may not detract from or interfere with the operations for which the Marine Corps is primally organized. Marine Corps Security Force Regiment is responsible for supporting the Navy with Marine security operations, while the Marine Security Guard protects embassies and consulates of the United States Department of State.

#### Fleet Marine Force

Main article: Fleet Marine Force
Four Marine Corps F-35B Lightning II stealth fighters flying over the USS *America* (LHA-6)

The combat power of the Marine Corps is centralized in the Fleet Marine Force (FMF), which itself is organized into Fleet Marine Force Atlantic, to support the U.S. Navy's Fleet Forces Command, and Fleet Marine Force Pacific, which supports the U.S. Navy's U.S. Pacific Fleet.

The basic Marine Corps unit for conducting operations is the Marine Air-Ground Task Force (MAGTF), which combines Marine Corps and Navy land, air, sea, and cyberspace capabilities into a single command. There are three different sized variants of a Marine Air-Ground Task Force, but each consists of a command element, ground combat element, aviation combat element, and logistics combat element.

A Marine ground combat element (GCE) is centered around Marine infantry, typically armed with a M27 Infantry Automatic Rifle. Unlike the Army, the Marine Corps does not train their own combat medics, relying on the Navy to provide hospital corpsman. These infantry units are supported by Marine Corps combat engineers, who conduct engineer reconnaissance, obstacle system emplacement, and breaching operations, and Marine Corps Force Reconnaissance teams. While the Marine Corps no longer operates its own tanks, opting to request support from the Army if needed, it maintains Light Armored Reconnaissance Battalions which operates the LAV-25 amphibious armored reconnaissance vehicle. Assault Amphibian Battalions operate the Assault Amphibious Vehicle and Amphibious Combat Vehicle, which enable the ground combat element to conduct amphibious landing operations. Marine Corps artillery operates the M777 howitzer and the M142 HIMARS, both supporting the ground combat element and the Navy at sea by striking enemy ships.
MV-22 Osprey tiltrotor aircraft from VMX-22 taking off from the USS *Wasp* (LHD-1)

The Marine aviation combat element (ACE) is the operational arm of Marine Corps Aviation, working to support the ground combat element. The F-35B Lightning II and AV-8B Harrier II are flown by off of Navy amphibious assault ships, while the F-35C Lightning II and F/A-18 Hornet are flown off of Navy carriers by Marine Corps pilots. The Marine Corps also operates the KC-130J to serve as a tanker and tactical airlift platform. The UH-1Y Venom helicopter provides the Marine Corps with light transport and attack, while the AH-1Z Viper is a dedicated attack helicopter. Medium lift squadrons fly the MV-22 Osprey, while heavy lift squadrons use the CH-53K King Stallion. The Marine Corps has also begun flying unmanned aerial vehciles, such as the MQ-9 Reaper and MQ-8 Fire Scout. Notably, the aviation combat element also includes Low-Altitude Air Defense Battalions, which employ the FIM-92 Stinger surface to air missile.

The smallest MAGTF is the Marine Expeditionary Unit (MEU), which are typically forward deployed on Navy ships. Commanded by a colonel, a Marine Expeditionary Unit consist of 2,200 marines split across a battalion landing team (ground combat element), composite helicopter squadron (aviation combat element), and a combat logistics element (logistics element). Marine Expeditionary Units are supplied for 15 days. Forward deployed Marine Expeditionary Units are often embarked on Navy amphibious assault ships as part of an amphibious ready group.

The next sized MAGTF is the Marine Expeditionary Brigade (MEB), which are organized for specific missions. Commanded by a brigadier general, Marine Expeditionary Brigades consist of 4,000 to 16,000 marines across a Regimental-sized ground combat element, a Marine Aircraft Group, and a Combat Logistics Regiment. Marine Expeditionary Brigades are supplied for 30 days and offer increased firepower and airpower over the Marine Expeditionary Unit.

The largest MAGTF is the Marine Expeditionary Force (MEF), which are primary warfighting forces for larger operations. A Marine Expeditionary Force is commanded by a lieutenant general and consist of 46,000 to 90,000 marines. Currently there are only three Marine Expeditionary Forces, each with its own Marine Division, Marine Aircraft Wing, Marine Logistics Group, and Marine Expeditionary Force Information Group. Marine Expeditionary Forces are supplied for 60 days.Certain elements are held at the Marine Expeditionary Force level, such as Force Reconnaissance. The MEF Information Group (MIG) also provides a number of functions, such as the intelligence battalion, radio battalion which conduct signals intelligence, electronic warfare, and cyberspace operations, communications battalion, the MEF support battalion, and the Air Naval Gunfire Liaison Company.
Marine Raiders with the 1st Marine Raider Battalion conducting a visit, board, search, and seizure operation
While not a MAGTF, the Marine Corps has begun to reorganize some of its regiments into Marine Littoral Regiments (MRL), which are similar in size to a Marine Expeditionary Unit. A Marine Littoral Regiment is a self-deployable force, designed to be naval in nature and operate in the littoral region. A Marine Littoral Regiment consists of a littoral combat team, a littoral anti-air battalion, and a combat logistics battalion. Notably, the Marine Littoral Regiment has no aviation combat element, unlike a Marine Expeditionary Unit.

Another Marine Corps element that does not function as part of the MAGTF are the Marine Raider Regiment, who function under United States Marine Forces Special Operations Command. Marine Raiders specialize in specialize in direct action, unconventional warfare, maritime interdiction, special reconnaissance, foreign internal defense, counterterrorism, and counterinsurgency missions.

#### Marine Corps commands

Under Headquarters Marine Corps, the Marine Corps is organized into the Fleet Marine Force, multiple commands, and Marine Corps service components to the unified combatant commands.

### U.S. Navy

Main article: United States Navy
USS *John C. Stennis* (CVN-74) and USS *Ronald Reagan* (CVN-76) conducting dual carrier strike group operations as part of the United States Seventh Fleet

The United States Navy (USN) is the United States Armed Forces' maritime force. Originally established in 1775 as the Continental Navy, the U.S. Navy consists of the Regular Navy and the Navy Reserve. The Navy is the United States' principal maritime service, responsible for maritime warfare operations.

The U.S. Navy is organized under the Department of the Navy, which is a military department under the leadership of the secretary of the Navy and the under secretary of the Navy. The U.S. Navy itself is led by the chief of naval operations and the vice chief of naval operations, both admirals who are advised by the master chief petty officer of the Navy.

The five enduring functions of the Navy are:

* Sea control
* Power projection
* Deterrence
* Maritime security
* SealiftThe USS *Vicksburg* (CG-69), USS *Roosevelt* (DDG-80), USS *Carney* (DDG-64), and USS *The Sullivans* (DDG-68) launching a coordinated missile volley

The nine specified tasks of the Navy are:

1. Conduct offensive and defensive operations associated with the maritime domain including achieving and maintaining sea control, to include subsurface, surface, land, air, space, and cyberspace.
2. Provide power projection through sea-based global strike, to include nuclear and conventional capabilities; interdiction and interception capabilities, maritime and/or littoral fires, to include naval surface fires; and close air support for ground forces.
3. Conduct ballistic missile defense. This is executed through the Navy's Aegis Ballistic Missile Defense System.
4. Conduct ocean, hydro, and river survey and reconstruction.
5. Conduct riverine operations. This is conducted by the Maritime Expeditionary Security Force and Naval Special Warfare Command.
6. Establish, maintain, and defense sea bases in support of naval, amphibious, land, air, or other joint operations as directed.
7. Provide naval expeditionary logistics to enhance the deployment, sustainment, and redeployment of naval forces and other forces operating within the maritime domain, to include joint sea bases, and provide sea transport for the Armed Forces other than which is organic to the individual military services, United States Special Operations Command, and United States Cyber Command. This is conducted by the Navy Expeditionary Logistics Support Group and Military Sealift Command.
8. Provide support for joint space operations to enhance naval operations, in coordination with the other military services (primarily the United States Space Force), combatant commands (primarily United States Space Command), and other U.S. government departments and agencies. U.S. Navy space operations are conducted by Navy Space Command.
9. Conduct nuclear operations in support of strategic deterrence, to include providing and maintaining nuclear surety and capabilities.

#### Naval Surface Forces

Main article: Naval Surface Forces
The stealth destroyer USS *Zumwalt* (DDG-1000) alongside the USS *Independence* (LCS-2)

The Naval Surface Forces (NAVSURFOR) is the backbone of the U.S. Navy's combat power, conducting surface warfare operations and operating its fleet of combat surface ships.

The Naval Surface Forces operates eleven nuclear powered aircraft carriers (CVN), split between the *Nimitz*-class and the newer *Gerald R. Ford*-class. Aircraft carriers are the centerpiece of the U.S. Navy's combat power, forming the nucleus of its eleven carrier strike groups (CSG). Each aircraft carrier has an embarked carrier air wing from the Naval Air Forces.

The Naval Surface Forces also operate 116 surface combatants. These include the *Ticonderoga*-class guided-missile cruisers, *Arleigh Burke-class* guided-missile destroyers (DDG) and *Zumwalt-class* stealth guided-missile destroyers. Cruisers and destroyers ofthen operate as part of a larger formations, where they serve as escorts for anti-aircraft and anti-submarine operations, but they also are able to conduct sea control and striker operations ashore with their tomahawk cruise missiles. The Navy also operates a complement smaller of *Freedom*-class and *Independence*-class littoral combat ships (LCS) that can be modularly reconfigured for specific mission sets. Having lacked a frigate since the *Oliver Hazard Perry*-class was decommissioned, the Navy is in the process of acquiring the new *Constellation*-class guided-missile frigates (FFG).

Finally, the Naval Surface Forces operate 31 amphibious warfare ships to support the Fleet Marine Force and its embarked Marine Air-Ground Task Forces as part of an amphibious ready group or expeditionary strike group. This includes the *America-class* landing helicopter assault (LHA) ships which can carry U.S. Marine Corps F-35B Lightning II fighters and helicopters, and *Wasp-class* landing helicopter dock (LHD) ships, which can carry both F-35B fighters, helicopters, and landing craft. These are in addition to the San Antonio-classs amphibious transport docks (LPD), and the Whidbey Island-class and *Harpers Ferry*-class dock landing ships.

#### Naval Submarine Forces

Main article: Naval Submarine Forces
The USS *Albuquerque* (SSN-706) attack submarine underway in the Atlantic Ocean

The Naval Submarine Forces (NAVSUBFOR) is often referred to as the "silent service," consisting of 68 commissioned submarines.

*Los Angeles*-class, *Seawolf*-class, and *Virginia*-class nuclear-powered attack submarines are capable of performing sea control mission by destroying enemy submarines and surface ships, conducting surveillance and reconnaissance, performing irregular warfare, covert troop insertion, mine and anti-mine operations, and land attack missions with tomahawk cruise missiles.

*Ohio*-class nuclear-powered ballistic missile submarines (SSBN) have the sole mission of being launch platforms for nuclear submarine-launched ballistic missile (SLBM). Each carries 20 UGM-133 Trident II SLBMs. The Navy is currently in the process of procuring the *Columbia*-class SSBNs to replace the *Ohio*-class. Some *Ohio*-class submarines have been converted to cruise-missile submarines (SSGN), capable of carrying 154 tomahawk cruise missiles and deploying 66 special operations forces personnel, such as Navy SEALs.

#### Naval Air Forces

Main article: Naval Air Forces
An F/A-18F Super Hornet from VX-23 flies over the USS *Gerald R. Ford* (CVN-78)

The Naval Air Forces (NAVAIRFOR) is the Navy's naval aviation arm, centered around the carrier air wing. The core of the carrier air wing are the Naval Air Forces strike fighter squadrons (VFA), which fly the F-35C Lightning II stealth fighter and the F/A-18E/F Super Hornet. A variant of the F/A-18, the EA-18G Growler is an electronic-warfare aircraft flown by electronic attack squadrons (VAQ) off of carriers or land bases. The E-2 Hawkeye provides carriers with airborne early warning and command and control, while the C-2A Greyhound keeps carriers supplied. The CMV-22B Osprey is currently in the process of replacing the C-2 Greyhound for carrier resupply.

The Naval Air Forces also operate the MH-60 Seahawk for anti-submarine warfare, anti-ship warfare, and search and rescue operations. The MH-53E is primarily used for anti-mine warfare, but can also be used for assault support.

Although primally centered on carriers, the Naval Air Forces do operate a small number of land-based aircraft. These include the P-3C Orion and P-8A Poseidon, which conduct anti-submarine warfare operations and serve as maritime patrol aircraft, alongside the unmanned MQ-4C Triton. The E-6 Mercury is also flown by the Navy to communicate instructions to U.S. strategic forces.

#### Naval Information Forces

Main article: Naval Information Forces
The USS *Lake Erie* (CG-70) launching a modified RIM-161 Standard Missile 3 to destroy a non-functional National Reconnaissance Office satellite as part of Operation Burnt Frost

The Naval Information Warfare Forces (NAVINFOR) were created in 2009 to integrate the Navy's communications, networks, naval intelligence, oceanography, meteorology, cryptology, electronic warfare, cyberspace operations, and space elements into a single organization. The mission of Navy information warfare is to provide assured command and control, battlespace awareness, and integrated fires to achieve freedom of maneuver across all warfighting domains.

In 2022, the Navy lost its only space operations unit when the Naval Satellite Operation Center, established in 1962, and its 13 Navy communications satellites transferred to the U.S. Space Force and became the 10th Space Operations Squadron.

#### Naval Special Warfare and Naval Expeditionary Combat Forces

Main articles: Naval Special Warfare Command and Naval Expeditionary Combat Command
Navy SEALs conducting winter warfare training
Naval Expeditionary Combat Forces, sometimes known as "sand sailors" operate ashore or in the littoral regions under Navy Expeditionary Combat Command. Their purpose is to clear the battlespace of hazards to the navy, secure maritime terrain, sea liens of communication, and resources, build infrastructure, awareness, logistics chains, and partnerships, and protect the Navy's fleets, facilities, and forces.

Navy Explosive Ordnance Disposal teams are responsible for conducting countering explosive devices that may present a hazard and also are able to clear harbors of navigational hazards, engage in underwater search and rescue, and perform limited underwater repairs on ships. The Maritime Expeditionary Security Force conducts operations in the littoral regions, including harbors, rivers, bays, and on land to provide maritime security operations. These include port and harbor security. The Naval Construction Force, or Seabees, are Navy engineers, able to construct facilities in support of naval operations while also providing force protection.

Naval Special Warfare are maritime special operations forces under Naval Special Warfare Command. These include the United States Navy SEALs and Special warfare combatant-craft crewmen.

#### Navy commands

The U.S. Navy is organized into eight navy component commands, which command operational forces and serve as joint force maritime component commands, fifteen shore commands, which support the fleets' operating forces, five systems commands, which oversee the technical requirements of the Navy, and nine type commands, which administratively manage units of a certain type.

### U.S. Air Force

Main article: United States Air Force
A B-2A Spirit stealth bomber from the 509th Bomb Wing escorted by two F-22A Raptor stealth fighters from the 3rd Wing
The United States Air Force (USAF) is the United States Armed Forces' air force. Originally established in 1947 when it gained independence from the U.S. Army, it traces its history back to through the United States Army Air Forces, United States Army Air Corps, United States Army Air Service, the Division of Military Aeronautics, Aviation Section, U.S. Signal Corps, to the birth of Aeronautical Division, U.S. Signal Corps on 1 August 1907. The U.S. Air Force serves as the principal air service, responsible for aerial warfare operations. The U.S. Air Force is composed of the Regular Air Force, Air Force Reserve, and Air National Guard.

The U.S. Air Force is organized under the Department of the Air Force, which is a military department under the leadership of the secretary of the Air Force and under secretary of the Air Force. The U.S. Air Force itself is led by the chief of staff of the Air Force and vice chief of staff of the Air Force, both generals who are advised by the chief master sergeant of the Air Force.

The five core missions of the Air Force are:

* Air superiority
* Global integrated intelligence, surveillance and reconnaissance
* Rapid global mobility
* Global strike
* Command and controlAir Mobility Command C-17 Globemasters performing low-level flight training

The eight specified functions of the Air Force are:

1. Conduct nuclear operations in support of strategic deterrence, to include providing and maintaining nuclear surety and capabilities.
2. Conduct offensive and defensive operations, to include appropriate air and missile defense, to gain and maintain air superiority and air supremacy as required, to enable the conduct of operations by U.S. and allied land, sea, air, space, and special operations forces.
3. Conduct global precision attack, to include strategic attack, interdiction, close air support, and prompt global strike.
4. Provide timely, globally integrated intelligence, surveillance, and reconnaissance capability and capacity from forward deployed locations and globally distributed centers to support world-wide operations.
5. Provide rapid global mobility to employ and sustain organic air and space forces and other military service and U. S. Special Operations Command forces, as directed, to include airlift forces for airborne operations, air logistical support, tanker forces for in-flight refueling, and assets for aeromedical evacuation.
6. Provide agile combat support to enhance the air and space campaign and the deployment, employment, sustainment, and redeployment of air and space forces and other forces operating within the air and space domains, to include joint air and space bases, and for the Armed Forces other than which is organic to the individual military services and U.S. Special Operations Command in coordination with the other military services, combatant commands, and U.S. Government departments and agencies.
7. Conduct global personnel recovery operations including theater-wide combat and civil search and rescue in coordination with the other military services, combatant commands, and DoD components.
8. Conduct globally integrated command and control for air and space operations.

#### Combat Air Force

Main articles: Air Combat Command, Air Force Global Strike Command, and Air Force Special Operations Command
Two F-22A Raptors from the 90th Fighter Squadron
The Combat Air Force (CAF) comprises the majority of the Air Force's combat power, consisting of its fighter, bomber, intercontinental ballistic missile, and special operations forces.

The Air Force's fighter forces are led by Air Combat Command's Fifteenth Air Force, with other fighter units under Pacific Air Forces and United States Air Forces in Europe. Air Force fighters are predominantly used to achieve air superiority and strike enemy ground and naval forces. The Air Force operates an expanding force of fifth-generation fighters. The F-22A Raptor stealth fighter is designed to replace the F-15C in air superiority operations carrying two AIM-9 Sidewinder and six AIM-120 AMRAAM missiles. It also has a significant air-to-ground mission, carrying two GBU-32 Joint Direct Attack Munition bombs, in addition to two AIM-9 and two AIM-120 missiles. Ultimately, the F-22 is intended to be replaced by the sixth-generation fighter Next Generation Air Dominance program. The F-22 is complemented by the more numerous F-35A Lightning II multi-role stealth fighter, which are in the process of replacing the F-16C fighters and A-10 attack aircraft in air superiority and ground attack roles, to include the nuclear strike mission.

The Air Force still operates an extremely sizable force of fourth-generation fighters. The F-15C Eagle is a dedicated air superiority fighter, while the F-15E Strike Eagle was modified to be a duel-role strike fighter, carrying both conventional and nuclear weapons. The F-15C Eagle and F-15E Strike Eagle are both being replaced by the F-15EX Eagle II, which is significantly more advanced. The F-16C Fighting Falcon is a multirole fighter that served as the primary Air Force fighter for decades, including as a dual-capable tactical nuclear strike fighter. The A-10C Thunderbolt II attack aircraft was the first Air Force fighter specifically designed for the close air support mission, operating against enemy ground forces and light naval ships with its GAU-8 Avenger gatling cannon and array of air to ground munitions.
A B-52 Stratofortress of the 2nd Bomb Wing and a B-2A Spirit of the 509th Bomb Wing flying in formation
The Air Force's bomber forces are organized under Air Force Global Strike Command's Eighth Air Force, executing long-range strike operations. The B-2A Spirit stealth bomber is capable of conducting both conventional and nuclear strike operations, flying through air defenses. The B-1B Lancer, to contrast, is a supersonic bomber that carries only conventional munitions and serves as the backbone of the bomber force. Both the B-2A Spirit and the B-1B Lancer are being replaced by the B-21 Raider stealth bomber, which can be equipped with both conventional and nuclear munitions. The B-52H Stratofortress is a long-range, heavy bomber that the Air Force has flown since the 1950s and operates a variety of conventional and nuclear munitions, including the AGM-86 air-launched cruise missile.

The Air Force's intercontinental ballistic missile forces are organized under Air Force Global Strike Command's Twentieth Air Force, serving as the land-component of the nuclear triad. The LGM-30G Minuteman III serves as the only ballistic missile operated by the Air Force, with 400 stationed in hardened silos. The LGM-30G will be replaced by the LGM-35A Sentinel intercontinental ballistic missile.
A formation of CV-22 Ospreys from the 353rd Special Operations Group
The Air Force's special operations forces are organized under Air Force Special Operations Command, consisting of both special operations aviation and Air Force special tactics airmen on the ground. The AC-130J Ghostrider gunships have the primary mission of close air support and air interdiction, using cannons and precision guided munitions. The MC-130J Commando II, also a variant of the C-130 Hercules, fly exfiltration and resupply operations for special operations forces, along with conducting air to air refueling for helicopters. The CV-22 Osprey is a tiltrotor aircraft used for the infiltration and exfiltration of special operations forces. While not under Air Force Special Operations Command, rescue operations are supported by the HC-130J Combat King II and HH-60W Jolly Green II combat rescue aircraft. The MQ-9 Reaper also serves as remotely piloted intelligence and strike aircraft, serving under Air Force Special Operations Command and Air Combat Command.
Air Force Pararescue with a HH-60 helicopter in the background
Air Force Special Tactics are the ground special warfare force of the U.S. Air Force, integrating air-ground operations. Special Tactics conduct four core missions. Global access teams assess and open airfields, ranging from international airports to dirt strips, in permissive or hostile locations to facilitate the landing and operation of air forces. Precision strike teams are trained to direct aircraft and other forces to conduct kinetic and non-kinetic strikes, as well as humanitarian aid drops. Special Tactics teams also conduct personnel recovery missions, possessing significant medical and rescue experience. Finally, Special Operations Surgical Teams conduct surgery and medical operations in battlefield operations in support of special operations.

The Air Force also operates a wide array of reconnaissance aircraft under Air Combat Command's Sixteenth Air Force, including the RQ-4 Global Hawk drone, U-2 Dragon Lady, and RC-135 Rivet Joint. Air Force operations are typically supported by command and control aircraft, such as the E-3 Sentry airborne warning and control system. The E-3 Sentry is in the process of being replaced by the E-7A Wedgetail.

#### Mobility Air Force

Main article: Air Mobility Command
A KC-46A Pegasus refueling a C-17A Globemaster III
The Mobility Air Force (MAF) are organized under Air Mobility Command and comprise the Air Force's airlift, air refueling, and aeromedical evacuation forces.

The airlift forces operate three different major aircraft. The C-5M Super Galaxy is the largest aircraft in the Air Force, serving as a strategic transport aircraft. The C-17A Globemaster III is the airlift forces most flexible aircraft, conducting both strategic and tactical airlift operations. It is also capable of conducting airborne operations for the Army and aerial resupply through airdropping cargo. Finally, the C-130J Super Hercules is a tactical airlifter, conducting both cargo airlift and supporting Army airborne operations. Other major airlift platforms include the VC-25, which serves as the personal plane of the president of the United States, better known as Air Force One.

The Air Force also operates three major aerial refueling tankers. The KC-46A Pegasus is its most modern tanker, replacing the aging KC-10A Extenders. The remaining tanker is the KC-135 Stratotanker, which has flown since the 1950s. Tankers are also capable of conducting limited airlift operations.

#### Air Force commands

The U.S. Air Force is organized into nine major commands, which conduct the majority of the service's organize, train, and equip functions and command forces attached to the combatant commands as joint force air component commands.

### U.S. Space Force

Main article: United States Space Force
Boeing X-37B spaceplane after deorbiting and landing
The United States Space Force (USSF) is the United States Armed Forces' space force and is the newest military branch. Originally established in 2019, it traces its history through Air Force Space Command and the Western Development Division to 1954. The United States Space Force is the principal space service, responsible for space warfare operations. The U.S. Space Force is composed of the Regular Space Force, not yet having organized a reserve component outside of the Air Force.

The U.S. Space Force is organized under the Department of the Air Force, which is a military department under the leadership of the secretary of the Air Force and under secretary of the Air Force. The U.S. Space Force itself is led by the chief of space operations and vice chief of space operations, both generals who are advised by the chief master sergeant of the Space Force.
Delta IV Heavy launch for the NROL-44 mission
The five core competencies of the Space Force are:

* Space security
* Combat power projection
* Space mobility and logistics
* Information mobility
* Space domain awareness

The five specified functions of the Space Force are:

1. Provide freedom of operation for the United States in, from, and to space.
2. Provide prompt and sustained space operations.
3. Protect the interests of the United States in space.
4. Deter aggression in, from, and to space.
5. Conduct space operations.

#### Orbital warfare and space electromagnetic warfare

Main articles: Space Delta 3 and Space Delta 9
The Starfire Optical Range, used for real-time high-fidelity tracking and imaging of satellites
The Space Force's combat power is centered around Space Delta 3, which conducts space electromagnetic warfare and Space Delta 9, which conducts orbital warfare.

Combat power projection operations ensure freedom of action in space for the U.S. and its allies and denies an adversary freedom of action in space. These are divided into offensive and defensive space operations. Defensive operations preserve and protect U.S. and allied space capabilities, which are further sub-divided into active and passive actions. Offensive operations target a U.S. adversary's space and counterspace capabilities, achieving space superiority.

Orbital warfare forces conduct protect and defend operations and providing U.S. national decision authorities with response options to deter and, when necessary, defeat orbital threats, while space electromagnetic warfare forces conduct offensive and defensive space control operations, and Space Force cyber forces conduct defensive cyber operations to protect space assets.

#### Cyber operations and Satellite Control Network

Main article: Space Delta 6
Satellite Control Network antenna at Kaena Point Space Force Station
Although the U.S. Space Force is not a cyber force, it does conduct extensive cyber operations under Space Delta 6. The primary focus of Space Force cyber operations is defending U.S. Space Force networks and ensuring the operations of its spacecraft, which are controlled remotely from ground stations. All space operations units have cyber squadrons assigned to defend them and is incorporating offensive cyber operations.

Additionally, Space Delta 6 is responsible for managing the Satellite Control Network, a global network of antennas used to communicate with the service's spacecraft. The 22nd Space Operations Squadron is responsible for overall operations, with the 21st Space Operations Squadron and 23rd Space Operations Squadron managing the ground station sites at Vandenberg Space Force Base, New Boston Space Force Station, Kaena Point Space Force Station, Diego Garcia, Guam, Greenland, and the United Kingdom.

#### Space domain awareness

Main article: Space Delta 2
15th Space Surveillance Squadron GEODSS telescope at White Sands Missile Range
The Space Force's Space Delta 2 operates the United States Space Surveillance Network, tracking 47,000 objects in space as of 2022. Space domain awareness encompasses the identification, characterization, and understanding of any factor associated with the space domain that could affect space operations.

Space Delta 2 sensors include the AN/FPS-85 phased array radar at Eglin Air Force Base and the Space Fence radar at Kwajalein Atoll operated by the 20th Space Surveillance Squadron, and a global network of three Ground-based Electro-Optical Deep Space Surveillance telescopes operated by the 15th Space Surveillance Squadron.

The 18th Space Defense Squadron, collocated with the Combined Space Operations Center, executes command and control of the Space Surveillance Network and manages the Space Catalog of all objects in Earth orbit. The 19th Space Defense Squadron focuses on objects further in cislunar space, beyond geosynchronous orbit, with a specific focus on supporting NASA's Artemis program and other human spaceflight operations.

#### Missile warning

Main article: Space Delta 4
Deployment of a Defense Support Program missile warning spacecraft from the Space Shuttle *Atlantis* on the STS-44 mission

The Space Force's Space Delta 4 uses orbital spacecraft and ground-based radars to conduct theater and strategic missile warning for the United States and its international partners. This includes the network of Upgraded Early Warning Radars at Beale Air Force Base, Clear Space Force Station, Cape Cod Space Force Station, Thule Air Base, and RAF Fylingdales, along with the AN/FPQ-16 PARCS radar at Cavalier Space Force Station. Currently the Space Force is working with the Missile Defense Agency to acquire the Long Range Discrimination Radar at Clear Space Force Station in Alaska. These ground-based radars also contribute to the Space Surveillance Network.

Space-based missile warning systems include the Defense Support Program and Space-Based Infrared System (SIBRS) spacecraft, which use infrared sensors to conduct missile defense and missile warning. SIBRS also has a battlespace awareness and technical intelligence mission. The Defense Support Program spacecraft are also capable of detecting nuclear detonations, in addition to space and missile launches.

#### Global Positioning System and military satellite communications

Main article: Space Delta 8
Members of the 4th Space Operations Squadron Mobile Operations Flight conducting armed convoy operations
The Space Force's Space Delta 8 is the operator of the Global Positioning System and the military's array of communications spacecraft.

The Global Positioning System is operated by the 2nd Space Operations Squadron, providing positioning, navigation, and timing information for civilian and military users across the entire world. The Space Force's GPS system has become an integral element of the global information infrastructure, being used in virtually all sectors of the economy, including agriculture, aviation, marine transportation, surveying and mapping, and transit navigation. It's timing signal is used to synchronize global communication systems, electrical power grids, and financial networks. The Global Positioning System also has a secondary mission of carrying nuclear detonation detection sensors.

Military satellite communication systems include the Fleet Satellite Communications System, UHF Follow-On satellite, and Mobile User Objective System, operated by the 10th Space Operations Squadron and inherited from the U.S. Navy. The payloads on the Wideband Global SATCOM and Defense Satellite Communications System are operated by the 53rd Space Operations Squadron, a role inherited from the U.S. Army. Finally, spacecraft operations for the Wideband Global SATCOM and Defense Satellite Communications System are conducted by the 4th Space Operations Squadron, in addition to the Milstar and Advanced Extremely High Frequency satellites, which both additionally support command and control of strategic nuclear forces.

#### Space launch

Main articles: Space Launch Delta 30 and Space Launch Delta 45
Launch of the Falcon Heavy on the STP-2 mission
The Space Force's space launch enterprise is organized under Space Systems Command, with Space Launch Delta 30 managing the Western Range from Vandenberg Space Force Base and Space Launch Delta 45 managing the Eastern Range from Cape Canaveral Space Force Station.
SpaceX's Starship, a condender for the Rocket Cargo program
The Space Force doesn't just manage military space launches, but also supports NASA and commercial space launches. Major space launch vehicles flown or scheduled to fly off of Space Force launch ranges include NASA's Space Launch System, SpaceX's Starship, Falcon Heavy, and Falcon 9, and United Launch Alliance's Vulcan, which will replace the Atlas V and Delta IV Heavy. Currently vehicles for the National Security Space Launch program include the Vulcan, Atlas V, Falcon Heavy, and Falcon 9 rockets.

An experimental program Air Force Research Laboratory vanguard program that the Space Force leads, Rocket Cargo, is exploring using rockets to supplement naval and air transport to rapidly deliver supplies to forces across the Earth. Current contenders include the SpaceX Starship rocket.

#### Space Force commands

The Space Force is organized into three field commands and multiple component field commands, which serve as joint force space component commands for the unified combatant commands.

### U.S. Coast Guard

Main article: United States Coast Guard
USCGC *Hamilton* (WMSL-753) sailing alongside the USCGC *William Flores* (WPC-1103)

The United States Coast Guard (USCG) is the United States Armed Forces' maritime security, maritime search and rescue, and maritime law enforcement force. It was first established in 1790 as the United States Revenue-Marine, and consists of the Regular Coast Guard and the Coast Guard Reserve.

Although it is always one of the six military branches, the Coast Guard is organized under the Department of Homeland Security under the leadership of the secretary of Homeland Security and the deputy secretary of Homeland Security. During time of war, the U.S. Coast Guard can be transferred to the Department of the Navy The Coast Guard itself is led by the commandant of the Coast Guard and vice commandant of the Coast Guard, both admirals advised by the master chief petty officer of the Coast Guard.
A Coast Guard Maritime Security Response team executing a boarding action from an MH-60 Jayhawk helicopter
The Coast Guard has six major operational mission programs, through which it executes its 11 statutory missions:

* Maritime law enforcement
* Maritime response
* Maritime prevention
* Maritime transport system management
* Maritime security operations
* Defense operations

Maritime law enforcement operations focus on protecting the United States maritime borders and assuring its maritime sovereignty. The Coast Guard conduct operations to suppress violations of U.S. law at sea, including counter-illegal migration and transnational organized crime operations. Codified mission executed under the maritime law enforcement program include drug interdiction, migrant interdiction, living marine resources, and other law enforcement.

Maritime response operations see the Coast Guard conducting search and rescue operations and rescuing mariners, responding to maritime disasters. Codified missions include search and rescue and marine environmental protection (response activities).
Coast Guard aviation MH-60 Jayhawk helicopter with a rescue swimmer
Maritime prevention operations prevent marine casualties and property losses, minimize security risks, and protect the marine environment. The Coast Guard does so by developing and enforcing federal regulations, conducting safety and security inspections, and analyzing port security risk assessments. Codified missions include ports, waterways, and coastal security, marine safety, and marine environmental protection (protection activities).

Maritime transport system management ensures a safe, secure, and environmentally sound waterways system. Codified missions include maintaining aides to navigation and ice operations.

Maritime security operations includes activities to detect, deter, prevent, and disrupt terrorist attacks, and other criminal acts in the U.S. maritime domain. It includes the execution of antiterrorism, response, and select recovery operations. This mission performs the operational element of the Coast Guard's Ports, Waterways, and Coastal Security mission and complements our Maritime Response and Prevention efforts. Codified missions include ports, waterways, and coastal security (response activities).

Coast Guard Defense Operations deploys the Coast Guard globally under the Department of Defense's unified combatant commands, where they operate under the joint force maritime component commands. Codified missions include defense readiness.

#### Coast Guard commands

The U.S. Coast Guard is organized into two area commands that cover the entire globe.

## Modernization and budget

### Budget

Main article: Military budget of the United States

The United States has the world's largest military budget, followed by People's Republic of China, India, United Kingdom, and Russia.

The James M. Inhofe National Defense Authorization Act for Fiscal Year 2023 established the topline defense budget as $857.9 billion, with the Department of Defense receiving $816.7 billion and the Department of Energy's national security programs receiving $30.3 billion, an 8% increase from Fiscal Year 2022.

The Department of the Air Force's budget, unlike the Department of the Army or Department of the Navy has a sizable portion of "pass-through." This is money that is not controlled or used by the Air Force, but is instead passed to other Department of Defense agencies and can be up to 17% of the department's budget, giving the impression that it is the most funded military department, but is actually the least funded.

### Army modernization

Main article: Army Futures Command
Launch of Precision Strike Missile from a M142 HIMARS at Vandenberg Space Force Base
The Army's modernization efforts, led by Army Futures Command are centralized into six priorities. Each priority is led by a Cross Functional Team.

Long Range Precision Fires is the land service's top modernization priority, focusing on rebuilding its Field Artillery Branch in response to longer range Russian and Chinese artillery systems. The Extended Range Cannon Artillery program is developing a cannon artillery piece that can accurately fire at targets 70 kilometers away, an increase from the 30 kilometer distance of current cannon artillery. The Precision Strike Missile is a surface-to-surface guided missile intended to be fired from the current M270 Multiple Launch Rocket System and M142 HIMARS, replacing their current missiles and doubling the rate of fire. The Army is also working with the Missile Defense Agency, U.S. Navy, and U.S. Air Force to develop a common hypersonic glide body, which the Army will employ as part of the mobile ground launched Long-Range Hypersonic Weapon program. Finally, the Army is working to modify the U.S. Navy's RIM-174 Standard ERAM and UGM-109 Tomahawk land attack cruise missile for ground launch to provide the Army with mid-range artillery capability.

The Next Generation Combat Vehicle program is developing a family of fighting vehicles for the Armor Branch to increase firepower, speed, and survivability. The Optionally Manned Fighting Vehicle is intended to replace the M2 Bradley, while the Armored Multi-Purpose Vehicle will replace the M113 armored personnel carriers, which have been used since the Vietnam War. The three variants of the Armored Multi-Purpose Vehicle are the general purpose, mission command, and medical treatment. The Mobile Protected Firepower is designed to be a light tank for Infantry Brigade Combat Teams. Finally, the Robotic Combat Vehicles are intended to come in light, medium, and heavy variants that will serve as scouts and escorts for crewed combat vehicles.
The V-280 Valor flying in tiltrotor configuration
The Future Vertical Lift program is intended to replace the current helicopter fleet flown by the Army Aviation Branch. The Future Long-Range Assault Aircraft is intended to replace the UH-60 Black Hawk and the Marine Corps UH-1Y Venom, with the Army selecting the Bell V-280 Valor tiltrotor aircraft as the winner. The Future Attack Reconnaissance Aircraft is intended to replace the AH-64 Apache in the attack and reconnaissance role.

The Army is working to modernize its communication networks for the Army Signal Corps, including developing a Unified Network consisting of an integrated tactical network, an integrated enterprise network, and unified network enabling capabilities. Other sub-efforts include developing a common operating environment, ensuring the network is interoperable with the other services and allied countries, and increasing the mobility and reducing the signature of its command posts. Efforts also include modernizing Global Positioning System technology to provide assured positioning, navigation, and timing, and working with the United States Intelligence Community and commercial space companies to increase the Army's access to space based intelligence, surveillance, and reconnaissance capabilities.
Army Rangers armed with the XM7 rifle and XM250 light machine gun
Recognizing that that United States is unlikely to have uncontested air superiority, the Army is undergoing a mass revitalization of its air and missile defense enterprise through the Air Defense Artillery Branch. The first layer of defense is the Ballistic Low-Altitude Drone Engagement, which will be mounted on the Common Remotely Operated Weapon Station and is designed to engage small unmanned aerial vehicle. The second layer is the Multi-Mission High Energy Laser, which will intercept small drones and munitions. The third and fourth layers comprise the Maneuver Air Defense Technology and Next-Generation Fires Radar, which will be integrated into short range air defense systems. The fifth layer puts a High-Energy Laser Tactical Vehicle Demonstrator onto a Medium Tactical Vehicle, while the sixth layer encompasses the Low-Cost Extended-Range Air Defense to supplement the MIM-104 Patriot missiles.

Finally, the Army is looking to improve the equipment of its soldiers in the Infantry Branch, for the Next Generation Squad Weapon, the Integrated Visual Augmentation System, and the Synthetic Training Environment. In 2022, the Army selected the SIG Sauer's XM7 rifle and XM250 light machine gun to replace the M4 carbine and the M249 light machine gun through the Next Generation Squad Weapon program.

### Marine Corps modernization

Main article: Force Design 2030
A Naval Strike Missile launcher on the Joint Light Tactical Vehicle
The Marine Corps modernization is being executed under the aegis of Force Design 2030, which is intended to return the service to its naval and amphibious roots and serve as a "stand-in" force, within contested areas of the maritime littorals. As part of this effort, the Marine Corps has begun establishing naval-focused Marine Littoral Regiments, consisting of a Littoral Combat Team, Littoral Anti-Air Battalion, and a Combat Logistics Battalion. The Littoral Combat Team is organized around an infantry battalion with an anti-ship missile battery, focused on conducting sea denial operations in support of the Navy.

The Marine Corps is in the process of acquiring the Amphibious Combat Vehicle, which is slated to replace the aging Assault Amphibious Vehicle. The Amphibious Combat Vehicle is intended to support the Marines during amphibious assaults and once they have reached shore. The Marine Corps has also adopted the Naval Strike Missile which is fielded from modified Joint Light Tactical Vehicle as part of the Marines' artillery battalions. The concept is that small mobile units of marines would move around different islands and shorelines with these weapons to fire on adversary ships.

Marine Corps aviation is also in the process of acquiring the CH-53K King Stallion helicopter for heavy lift, replacing the current CH-53E Super Stallion in the role. The Marine Corps is also looking to replace its UH-1Y Venom helicopters through the Future Vertical Lift program and is in the process of acquiring a significant number of unmanned aerial vehicles, such as the MQ-9 Reaper.

### Navy modernization

Rendering of USS *Constellation* (FFG-62)

Like the Marine Corps, the Navy is in the process of overhauling and modernizing its fleet with a renewed focus. While the Navy is continuing to purchase *Arleigh Burke*-class destroyers, it is embarking on the DDG(X) program of guided missile destroyers to replace it and the *Ticonderoga*-class cruisers. The DDG(X) will include directed energy weapons and potentially hypersonic weapons.

The *Constellation*-class frigate will be the first frigates in the U.S. Navy since the *Oliver Hazard Perry*-class frigates were retired. The *Constellation*-class frigates are based on the Italian FREMM multipurpose frigates and will replace the littoral combat ships.
Rendering of a *Columbia*-class ballistic missile submarine

The Navy is starting development on the SSN(X) attack submarines, intended to replace the *Virginia*-class and *Seawolf*-class submarines. The *Columbia*-class submarines will begin replacing the *Ohio*-class ballistic missile submarines. The acquisition of the *Columbia*-class submarines is the first priority of the Navy.

With Naval Aviation, the service is continuing to procure additional *Gerald R. Ford*-class aircraft carriers and F-35C Lightning II stealth fighters. Ultimately, the F/A-XX program is intended to produce a sixth-generation fighter to replace the legacy F/A-18E/F Super Hornets as part of the Carrier Air Wing and is using the Future Vertical Lift program to replace its fleet of SH-60 Seahawk helicopters.

The service is also investing heavily in unmanned platforms, such as unmanned surface vehicles, using the Ghost Fleet Overlord to test the concept. It is also fielding unmanned aerial vehicles, such as the land-based MQ-4C Triton for maritime patrol and the carrier-based MQ-25A Stingray for aerial refueling, replacing the F/A-18F in the role.

### Air Force modernization

B-21 Raider at United States Air Force Plant 42
F-15EX Eagle II from the 40th Flight Test Squadron

The B-21 Raider stealth bomber is the first new Air Force bomber since the B-2A Spirit. The B-21 will replace the B-2 and the B-1B Lancer, flying alongside the B-52 Stratofortress. The development of the B-21 Raider was led by the Department of the Air Force Rapid Capabilities Office. The service is also along in developing the LGM-35 Sentinel intercontinental ballistic missile to replace the LGM-30G Minuteman IIIs.

The U.S. Air Force is also in the process of developing the Next Generation Air Dominance program, which will produce a sixth generation fighter to replace the F-22 Raptor. The service is also procuring the fourth generation F-15EX Eagle II to replace the aging F-15C Eagle and F-15E Strike Eagle. It is also procuring the T-7A Red Hawk trainer jet to replace the 1950s-era T-38 Talon.

While not an aircraft, the Air Force is investing in developing the AIM-260 Joint Advanced Tactical Missile to replace or supplement that AIM-120 AMRAAM for its fighter forces. It is also procuring the AGM-181 Long Range Stand Off Weapon to replace the AGM-86 ALCM as a nuclear air launched cruise missile for the B-21 Raider and the B-52 Stratofortress. The air service is also investing in hypersonic weapons, with the AGM-183 Air-Launched Rapid Response Weapon, the Hypersonic Air-breathing Weapon Concept, and the Hypersonic Attack Cruise Missile in development.

### Space Force modernization

Main article: Space Warfighting Analysis Center
Concept for a Space Force Rocket Cargo program conducting humanitarian assistance and disaster relief operations
While a new service, the U.S. Space Force is undergoing intensive modernization efforts. The Deep Space Advanced Radar Capability (DARC) is intended to track objects in geosynchronous orbit with three sites, one in the United States, one in the Indo-Pacific, and one in Europe.
NASA's return to the Moon through the Artemis program is leading to a greater emphasis on cislunar domain awareness
Oracle, a spacecraft developed by the Air Force Research Laboratory for the Space Force, will demonstrate technologies that the space service needs for cislunar domain awareness – tracking objects outside of geosynchronous orbit and between Earth and the Moon. The spacecraft itself will launch to an area of gravitational stability between the Earth and the Moon to conduct operations, using a wide-field sensor and a more sensitive narrow field sensor to discover and maintain custody of objects operating in this region. Oracle will directly support NASA's Artemis program as it returns to the Moon and track potentially hazardous near-Earth objects in support of planetary defense operations.

Also an Air Force Research Laboratory program for the Space Force, Arachne is the keystone experiment in the Space Solar Power Incremental Demonstrations and Research Project, which aims to prove and mature essential technologies for a prototype space-based solar power transmission system capable of powering a forward operating base. Arachne will specifically demonstrate and mature technologies related to more efficient energy generation, radio frequency forming, and radio frequency beam beaming. Current forward operation bases rely on significant logistics convoys to transport fuel for power – space-based solar power would move these supply lines to space, where they are unable to be easily attacked. Much how GPS started as a military program and was opened to civilian use, Space Force provided space-based solar power could transition to common use as well. Other space-based power beaming demonstrators include the Space Power InfraRed Regulation and Analysis of Lifetime (SPIRRAL) and Space Power INcremental DepLoyable Experiment (SPINDLE) experiments.
Concept for a space-based solar power spacecraft
The Navigation Technology Satellite-3 (NTS-3), building on the Space Force's Global Positioning System constellation, is an Air Force Research Laboratory spacecraft that will operate in geosynchronous orbit to test advanced techniques and technologies to detect and mitigate interference to positioning, navigation, and timing capabilities and increase system resiliency for military, civil, and commercial users. NTS-3 is a Vanguard program, which mark potentially game changing technologies.

The Space Force's Rocket Cargo program is another Air Force Research Laboratory Vanguard program, which is focused on leasing space launch services to quickly transport military materiel to ports across the globe. If proven viable, the Space Force's Space Systems Command is responsible for transitioning it to a program of record. United States Transportation Command would be the primary user of this capability, rapidly launching up to 100 tons of cargo anywhere in the world.

## Personnel

Active duty military personnel numbers
 Air Force and Space Force
 Marine Corps
 Navy
 Army
The U.S. Armed Forces is the world's third largest military by active personnel, after the Chinese's People's Liberation Army and the Indian Armed Forces, consisting of 1,359,685 servicemembers in the regular armed forces with an additional 799,845 servicemembers in the reserves as of 28 February 2019.

While the United States Armed Forces is an all-volunteer military, conscription through the Selective Service System can be enacted at the president's request and Congress' approval, with all males ages 18 through 25 who are living in the United States are required to register with the Selective Service. Although the constitutionality of registering only males for Selective Service was challenged by federal district court in 2019, its legality was upheld by a federal appeals court in 2020.

As in most militaries, members of the U.S. Armed Forces hold a rank, either that of officer, warrant officer or enlisted, to determine seniority and eligibility for promotion. Those who have served are known as veterans. Rank names may be different between services, but they are matched to each other by their corresponding paygrade. Officers who hold the same rank or paygrade are distinguished by their date of rank to determine seniority, while officers who serve in certain positions of office of importance set by law, outrank all other officers in active duty of the same rank and paygrade, regardless of their date of rank.

### Personnel by service

Total number of authorized personnel in FY23.

### Rank structure

Rank in the United States Armed Forces is split into three distinct categories: officers, warrant officers, and enlisted personnel. Officers are the leadership of the military, holding commissions from the president of the United States and confirmed to their rank by the Senate. Warrant officers hold a warrant from the secretaries of the military departments, serving as specialist in certain military technologies and capabilities. Upon promotion to chief warrant officer 2, they gain a commission from the president of the United States. Enlisted personnel constitute the majority of the armed forces, serving as specialists and tactical-level leaders until they become senior non-commissioned officers or senior petty officers. Military ranks across the services can be compared by U.S. Uniformed Services pay grade or NATO rank code.

### Women in the armed forces

The existing four-star women in the United States Armed Forces in March 2023 during Women's History Month. From left to right: Admiral Linda L. Fagan, General Jacqueline Van Ovost, General Laura J. Richardson and Admiral Lisa Franchetti
Two female Marines of the 2nd Marine Regiment patrolling in Afghanistan

All branches of the U.S. military enlisted women during World War II. The Woman's Army Auxiliary Corps was established by the Army in 1942. Also formed during this time were the Women's Airforce Service Pilots (WASPs), the Navy's Women Accepted for Volunteer Emergency Services (WAVES), the Marine Corps Women's Reserve, and the Coast Guard Women's Reserve (SPARS). Women saw combat during World War II, first as nurses in the Pearl Harbor attacks on 7 December 1941. In 1944, WACs arrived in the Pacific and in Normandy. During the war, 67 Army nurses and 16 Navy nurses were captured and spent three years as Japanese prisoners of war. There were 350,000 American women who served during World War II, and 16 were killed on duty. In total, they gained over 1,500 medals, citations, and commendations.

After World War II, demobilization led to the vast majority of serving women being returned to civilian life. Law 625, The Women's Armed Services Act of 1948, was signed by President Harry S. Truman, allowing women to serve in the U.S. Armed Forces in fully integrated units during peace time, with only the WAC remaining a separate female unit. During the Korean War of 1950–1953, many women served in the Mobile Army Surgical Hospitals. During the Vietnam War, 600 women served in the country as part of the Air Force, along with 500 members of the WAC and over 6,000 medical personnel and support staff. The Ordnance Corps began accepting female missile technicians in 1974 and female crewmembers and officers were accepted into Field Artillery missile units.

In 1974, the first six women naval aviators earned their wings as Navy pilots. The congressionally mandated prohibition on women in combat places limitations on the pilots' advancement, but at least two retired as captains. The 1991 Gulf War proved to be the pivotal time for the role of women in the U.S. Armed Forces to come to the attention of the world media; there are many reports of women engaging enemy forces during the conflict.

In 1991, women were permitted to fly military aircraft. Since 1994, women can serve on U.S. combat ships. In 2010, the ban on women serving on submarines was lifted.
A female U.S. Air Force fighter pilot at Osan Air Base in South Korea
On 3 December 2015, U.S. defense secretary Ashton Carter announced that all military combat positions would become available to women. This gave women access to the roughly 10% of military jobs which were previously closed off due to their combat nature. These restrictions were due in part to studies which stated that mixed gender units are less capable in combat. The decision gave military services time until January 2016 to provide plans on how they will enforce the policy change. Many women believe this will allow for them to improve their positions in the military, since most high-ranking officers start in combat positions. Since women are now available to work in any position in the military, female entry into the draft has been proposed.

No woman has ever become a Navy SEAL. However, in July 2021, the first woman graduated from the Naval Special Warfare (NSW) training program to become a Special Warfare Combatant craft Crewman (SWCC). The SWCC directly supports the SEALs and other commando units, and are experts in covert insertion and extraction special operation tactics.

Despite concerns of a gender gap, all personnel, both men and women, at the same rank and time of service are compensated the same rate across all branches. On 1 June 2022, ADM Linda L. Fagan assumed command of the U.S. Coast Guard thus becoming the not only the first woman to serve as Commandant of the Coast Guard but also the first woman in American history to serve as a service chief in the U.S. Military.

A study conducted by the RAND Corporation also suggests that women who make the military their career see an improved rate of promotion, as they climb through the military ranks at a faster rate.

As per the DoD's report on sexual assault within the U.S. Army for the fiscal year of 2019, 7,825 cases of sexual assault had been reported with the service members either victims or subjects of the assault. There has been a 3% increase in the number of cases as compared to the 2018 report.

As of 2021, there are 231,741 women in the military, representing 17.3% of the total active duty force. Since 2017, the percentage of women in active duty service has increased by 1.1%.

## Order of precedence

The Joint Armed Forces Color Guard at Arlington National Cemetery
Soldiers, marines, sailors, marines, airmen, guardians, and coast guardsmen from their services ceremonial units stand in formation at Arlington National Cemetery

Under Department of Defense regulation, the various components of the U.S. Armed Forces have a set order of seniority. Examples of the use of this system include the display of service flags, and placement of soldiers, marines, sailors, airmen, guardians, and coast guardsmen in formation.

* Cadets, U.S. Military Academy
* Midshipmen, U.S. Naval Academy
* Cadets, U.S. Air Force Academy
* Cadets, U.S. Coast Guard Academy
* Midshipmen, U.S. Merchant Marine Academy
* United States Army
* United States Marine Corps
* United States Navy
* United States Air Force
* United States Space Force
* United States Coast Guard
* Army National Guard
* United States Army Reserve
* United States Marine Corps Reserve
* United States Navy Reserve
* Air National Guard
* United States Air Force Reserve
* United States Coast Guard Reserve
* Other training and auxiliary organizations of the Army, Marine Corps, Merchant Marine, Civil Air Patrol, and Coast Guard Auxiliary, as in the preceding order.

While the U.S. Navy is older than the Marine Corps, the Marine Corps takes precedence due to previous inconsistencies in the Navy's birth date. The Marine Corps has recognized its observed birth date on a more consistent basis. The Second Continental Congress is considered to have established the Navy on 13 October 1775 by authorizing the purchase of ships, but did not actually pass the "Rules for the Regulation of the Navy of the United Colonies" until 27 November 1775. The Marine Corps was established by an act of the Second Continental Congress on 10 November 1775. The Navy did not officially recognize 13 October 1775 as its birth date until 1972, when then–chief of naval operations Admiral Elmo Zumwalt authorized it to be observed as such.

The Coast Guard is normally situated after the Space Force, however if it is moved to the Department of the Navy, then its place in the order of precedence changes to being situated after the Navy and before the Air Force.