|United States Armed Forces|
|Founded||14 June 1775[a]|
|Headquarters||The Pentagon, Arlington County, Virginia|
|Commander-in-Chief||President Joe Biden|
|Secretary of Defense||Lloyd Austin|
|Secretary of Homeland Security||Alejandro Mayorkas|
|Chairman of the Joint Chiefs of Staff||GEN Mark A. Milley, USA|
|Vice Chairman of the Joint Chiefs of Staff||ADM Christopher W. Grady, USN|
|Senior Enlisted Advisor to the Chairman||SEAC Ramón Colón-López, USAF|
|Military age||17 with parental consent, 18 for voluntary service.[b]|
|Conscription||Male only (inactive since 1973)|
|17 million, age 18–25 (2016)|
|2 million (2016)|
|Active personnel||1,376,658 (ranked 3rd)|
|Budget||US$782 billion (2022) (ranked 1st)|
|Percent of GDP||3.42% (2019)|
|History||Military history of the United States|
|Military service branches|
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. 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. All six armed services are among the eight uniformed services of the United States.
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 American Civil War, keeping the Confederacy from seceding from the republic. 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 U.S. Armed Forces are one of the largest military forces in terms of personnel. They draw their personnel from a large pool of paid volunteers. Although conscription has been used in the past, it has not been used 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 followed by the U.S. Navy and U.S. Marine Corps combined are second and third respectively in global rankings of aviation fleet size. 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.
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 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.
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.
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.
Main article: United States Army
The United States Army (USA) is the land service branch of the United States Armed Forces and part of the civilian-led Department of the Army, which is led by the Secretary of the Army. The military head of the U.S. Army is the chief of staff of the Army, who is assisted by the vice chief of staff of the United States Army and sergeant major of the Army. It was founded on 14 June 1775 as the Continental Army.
The five core competencies of the Army are to conduct:
The U.S. Army is composed of the Regular Army, United States Army Reserve, and United States Army National Guard. The U.S. Army is organized into four army commands, which conduct the majority of the service's organize, train, and equip functions, ten Army service component commands, which command forces attached to the combatant commands, and twelve direct reporting units. The Army also organizes its personnel into 21 different basic branches.
The four army commands are:
The U.S. Army's field structure is broken into several subdivisions under its commands:
||Army group: Only used during large scale wars or as part of multinational commands, consist of four to five field armies and 400,000 to 1 million soldiers. Usually responsible for directing campaigns in a certain geographical area and commanded by a general|
||Field army: Consists of two or more corps or more than four divisions and consists of up to 90,000 soldiers commanded by a general or lieutenant general.|
||Corps: Consists of two to five divisions and 20,000 to 45,000 soldiers commanded by a lieutenant general. A corps is the highest level of command that provides operational direction for combat operations, with higher levels concerned with administration rather than operations.|
||Division: Consists of three to four brigades and 10,000 to 15,000 soldiers commanded by a major general and are subdivided into airborne, armored, infantry, and mountain divisions. Each division conducts major tactical operations and sustained battlefield operations.|
||Brigade / Regiment / Group: Consists of two to three battalions and 3,000 to 5,000 soldiers commanded by a colonel. Armored and Ranger units are organized into regiments and Special Forces are organized into groups. In 2016, the Army reorganized its brigades into brigade combat teams, which are autonomous modular brigades that most commonly include one combat arms brigade and its assigned support and fire units.|
||Battalion / Squadron: Consist of four to six companies and consist of up to 1,000 soldiers commanded by a lieutenant colonel. Battalions are organized into combat arms battalions, combat support, and combat service support battalions by unit type. Armored and air cavalry are organized into squadrons. Battalions and squadrons conduct independent operations of limited scope and duration.|
||Company / Battery / Troop: Consist of three to four platoons and a few dozen to 200 soldiers commanded by a captain. Artillery is organized into batteries and armored and air cavalry units are organized into troops. Companies, batteries, and troops are tactical-sized units that can perform a battlefield function on its own.|
||Platoon: Consists of two to three squads and up to 36 soldiers led by a first lieutenant or second lieutenant.|
||Squad / Section: Consists of two teams and four to ten soldiers led by a staff sergeant.|
||Team: Consists of four soldiers and led by a sergeant or corporal.|
Main article: United States Marine Corps
The United States Marine Corps (USMC) is the maritime land force service branch of the United States Armed Forces and part of the civilian-led Department of the Navy, which is led by the Secretary of the Navy. The military head of the U.S. Marine Corps is the commandant of the Marine Corps, who is assisted by the assistant commandant of the Marine Corps and sergeant major of the Marine Corps. The Marine Corps was founded on 10 November 1775 as the Continental Marines and disbanded in 1783, before being reestablished as the United States Marine Corps on 11 July 1798.
The Marine Corps is responsible for amphibious warfare and expeditionary warfare operations, having a very close relationship with its coequal sister service, the United States Navy. The U.S. Marine Corps is composed of the Regular Marine Corps and the United States Marine Corps Reserve. The central unit of the Marine Corps is a Marine Air-Ground Task Force, which consist of a command element, ground combat element, aviation combat element, and logistics combat element. The Marine Corps is divided in the Fleet Marine Force and the Supporting Establishment.
The Fleet Marine Force includes:
The U.S. Marine Corps' Marine Air-Ground Task Force structure is broken into several levels under the Fleet Marine Force:
|Marine Expeditionary Force: The largest type of Marine Air-Ground Task Force, consists of a marine division, air wing, and logistics group under a headquarters group and 20,000 to 90,000 marines and sailors commanded by a lieutenant general. The principal warfighting organization of the Marine Corps during larger crisis or contingencies, MEFs' are self-sufficient for 60 days.|
|Marine Expeditionary Brigade: The medium type of Marine Air-Ground task Force, consists of a reinforced infantry regiment, reinforced composite marine aircraft group, and task organized logistics combat regiment under a command element and 20,000 marines and sailors commanded by a brigadier general. Forward deployed MEUs provide an expeditionary force in readiness and are self-sufficient for 30 days.|
|Marine Expeditionary Unit: The light type of Marine Air-Ground task Force, consists of a reinforced infantry battalion, reinforced composite aviation squadron, and task organized combat logistics battalion command element and 2,600 marines and sailors commanded by a colonel. Forward deployed MEUs provide an expeditionary force in readiness, capable of commencing missions on a six-hour timeline and are self-sufficient for 15 days.|
The U.S. Marine Corps' unit structure is broken into several subdivisions under the Fleet Marine Force:
||Marine division / Marine aircraft wing: Consists of three marine regiments or marine aircraft groups and 6,561 marines commanded by a major general.|
||Marine logistics group: Consists of three combat logistics regiments and commanded by a brigadier general.|
||Marine regiment / Marine aircraft group: Consist of three or more marine battalions or marine aviation squadrons and 2,187 marines commanded by a colonel.|
||Marine battalion / Marine aviation squadron: Consists of three or more companies or 24 aircraft and 729 marines commanded by a lieutenant colonel.|
||Company: Consists of three or more platoons and 243 marines commanded by a Captain.|
||Platoon: Consists of three squads and 27 marines commanded by a first lieutenant or second lieutenant.|
||Squad / Section: Consists of three teams and nine marines led by a sergeant.|
||Fire team: Consists of four marines led by a corporal.|
Main article: United States Navy
The United States Navy (USN) is the maritime service branch of the United States Armed Forces and part of the civilian-led Department of the Navy, which is led by the Secretary of the Navy. The military head of the U.S. Navy is the chief of naval operations, who is assisted by the vice chief of naval operations and master chief petty officer of the Navy. The Navy was founded on 13 October 1775 as the Continental Navy, which was disbanded on 1 August 1785 before being reestablished as the modern U.S. Navy on 20 January 1794.
The five enduring functions of the Navy are:
The U.S. Navy is composed of the Regular Navy and United States Navy Reserve. The U.S. Navy is organized into eight navy component commands, which command operational forces, 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.
The navy component commands are:
The U.S. Navy's unit structure is broken into several subdivisions under the operating force:
The U.S. Navy's unit structure is broken into several subdivisions under the type command structure. For Naval Air Forces:
||Carrier air wing / Wing: Consists of four strike fighter squadrons, one electronic attack squadron, one carrier airborne early warning squadron, on helicopter sea combat squadron, one helicopter maritime strike squadron, and one fleet logistic support squadron under the command of a captain.|
||Squadron: Consists of several aircraft under the command of a commander.|
Main article: United States Air Force
The United States Air Force (USAF) is the air service branch of the United States Armed Forces and part of the civilian-led Department of the Air Force, which is led by the Secretary of the Air Force. The military head of the U.S. Air Force is the chief of staff of the Air Force, who is assisted by the vice chief of staff of the United States Air Force and chief master sergeant of the Air Force. It achieved independence on 18 September 1947 from the U.S. Army, but directly traces its history 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 five core missions of the Air Force are:
The U.S. Air Force is composed of the Regular Air Force, United States Air Force Reserve, and United States Air National Guard. 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.
The Air Force's major commands are:
The U.S. Air Force's field structure is broken into several subdivisions under its major commands:
||Numbered air force / Named air force: Consists of multiple wings with a geographic or functional assignment commanded by a general or lieutenant general.|
||Wing: Consists of two or more groups commanded by a brigadier general or colonel. Wings typically contain an operations group, maintenance group, mission support group, and a medical group. There are two types of wings: composite wings or objective wings. Composite wings operate more than one kind of aircraft and may be designated as self-contained units designed for quick air intervention anywhere in the world. Objective wings are based on a single purpose, such as an operational, air base, or specialized mission.|
||Group: Consists of two or more squadrons whose mission are similar or complementary commanded by a colonel.|
||Squadron: Consist of two or more flights commanded by a lieutenant colonel or major.|
||Flight: Consists of individual airmen, sections, or shops commanded by a captain.|
||Element / Section: Consists of two or more airmen led by a staff sergeant or senior airman.|
Main article: United States Space Force
The United States Space Force (USSF) is the space service branch of the United States Armed Forces and part of the civilian-led Department of the Air Force, which is led by the Secretary of the Air Force. The military head of the U.S. Space Force is the chief of space operations, who is assisted by the vice chief of space operations and senior enlisted advisor of the Space Force. It achieved independence on 20 December 2019 from the U.S. Air Force, but directly traces its history through Air Force Space Command to 1 September 1982, with even earlier history traced to the Western Development Division established on 1 July 1954.
The five core competencies of the Space Force are:
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 Space Force is organized into three field commands.
The Space Force's field commands are:
The Space Force's field structure is broken into several subdivisions under its field commands:
||Delta / Garrison: Consists of two or more squadrons, or attached Air Force mission support and medical groups for garrisons and wings and a Space Force operations group for wings as well, commanded by a brigadier general or colonel. Deltas are responsible for executing a specific mission, while garrisons are responsible for installations support and management. Space Force wings are a legacy organizational structure inherited from the Air Force that manage a singular base and mission under one organization and are being phased out in favor of deltas and garrisons.|
||Squadron: Consist of two or more flights commanded by a lieutenant colonel.|
||Flight / Crew: Consists of individual guardians commanded by a captain, first lieutenant, or second lieutenant.|
Main article: United States Coast Guard
The United States Coast Guard (USCG) is the maritime security, search and rescue, and law enforcement service branch of the United States Armed Forces and part of the Department of Homeland Security, which is led by the Secretary of Homeland Security. It is the only military branch outside the Department of Defense, but can be transferred to the civilian-led Department of the Navy, which is led by the Secretary of the Navy, in the case that congress stipulates that when declaring war or the president directs. The military head of the U.S. Coast Guard is the commandant of the Coast Guard, who is assisted by the vice commandant of the Coast Guard and master chief petty officer of the Coast Guard. The Coast Guard was founded as a military service branch on 4 August 1790 as the United States Revenue-Marine, before being renamed on 31 July 1894 as the United States Revenue Cutter Service. On 28 January 1915 it was merged with the civilian United States Life-Saving Service to form the United States Coast Guard. In 1939, the civilian United States Lighthouse Service was merged into the Coast Guard. The Revenue-Marine, and later the Coast Guard, were organized under the Department of the Treasury, transferring to the Department of the Navy during World War I and World War II. In 1967 it was transferred to the Department of Transportation, where it would reside until 2003 when it was permanently transferred to the Department of Homeland Security.
The eleven missions of the Coast Guard are:
The U.S. Coast Guard is composed of the Regular Coast Guard and United States Coast Guard Reserve. The U.S. Coast Guard is organized into two area commands that cover the entire globe.
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. There are eleven unified combatant commands that come in two types. Geographic commands, such as Africa, Central, European, Indo-Pacific, Northern, Southern and Space commands are responsible for planning and operations in a certain geographic area. Functional commands, such as Cyber, Special Operations, Strategic, and Transportation commands are responsible for a functional activity that crosses geographic boundaries. 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 or Marine Corps 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.
Main article: Military budget of the United States
The United States has the world's largest military budget. In the fiscal year 2019, $693 billion in funding were enacted for the DoD and for "Overseas Contingency Operations" in the War on Terrorism. Outside of direct DoD spending, the United States spends another $218 to $262 billion each year on other defense-related programs, such as Veterans Affairs, Homeland Security, nuclear weapons maintenance and DoD.
In FY2016 $146.9 billion was allocated for the Department of the Army, $168.8 billion for the Department of the Navy, $161.8 billion for the Department of the Air Force, and $102.8 billion for DoD-wide spending. By function, $138.6 billion was requested for personnel, $244.4 billion for operations and maintenance, $118.9 billion for procurement, $69.0 billion for research and development, $1.3 billion for revolving and management funds, $6.9 billion for military construction, and $1.3 billion for family housing.
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. In 2012, it was reported that only one in four persons in the United States of the proper age meet the moral, academic and physical standards for military service.
2020 Demographic Reports  and end strengths for reserve components.
|U.S. Marine Corps||180,958||159,508||21,450||181,845||15,551||20,484|
|U.S. Air Force||329,614||265,369||64,245||270,462||50,750||174,754|
|U.S. Space Force||6,434||3,692||2,742|
|U.S. Coast Guard||42,042||32,782||8,239|
|Other DoD personnel||108,833|
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.
|NATO code||OF-10||OF-9||OF-8||OF-7||OF-6||OF-5||OF-4||OF-3||OF-2||OF-1||OF(D)||Student officer|
|Uniformed services pay grade||Special grade||O-10||O-9||O-8||O-7||O-6||O-5||O-4||O-3||O-2||O-1||Officer candidate|
| United States Army
|General of the Army||General||Lieutenant general||Major general||Brigadier general||Colonel||Lieutenant colonel||Major||Captain||First lieutenant||Second lieutenant||Cadet / Officer candidate||
| United States Marine Corps
|General||Lieutenant general||Major general||Brigadier general||Colonel||Lieutenant colonel||Major||Captain||First lieutenant||Second lieutenant||Midshipman / officer candidate |
| United States Navy
|Fleet admiral||Admiral||Vice admiral||Rear admiral||Rear admiral
|Ensign||Midshipman / officer candidate |
| United States Air Force
|General of the Air Force||General||Lieutenant general||Major general||Brigadier general||Colonel||Lieutenant colonel||Major||Captain||First lieutenant||Second lieutenant||Cadet / Officer trainee||
| United States Space Force
|General||Lieutenant general||Major general||Brigadier general||Colonel||Lieutenant colonel||Major||Captain||First lieutenant||Second lieutenant||Cadet / Officer trainee||
| United States Coast Guard
|Admiral||Vice admiral||Rear admiral||Rear admiral
|Ensign||Cadet / officer candidate|
Officers represent the top 18% of the armed forces, serving in leadership and command roles. Officers are divided into three categories:
Officers are typically commissioned as second lieutenants or ensigns with a bachelor's degree after several years of training and education or directly commissioning from civilian life into a specific specialty, such as a medical professional, lawyer, chaplain, or cyber specialist.
Officers are commissioned through the United States service academies, Reserve Officer Training Corps programs, and the Officer Candidate and Officer Training Schools. During a time of war, officers may be promoted to five-star ranks, with general of the Army, fleet admiral, and general of the Air Force the only five-star ranks currently authorized.
|Uniformed services pay grade||W-5||W-4||W-3||W-2||W-1|
| United States Army
|Chief warrant officer 5||Chief warrant officer 4||Chief warrant officer 3||Chief warrant officer 2||Warrant officer 1
| United States Marine Corps
|Chief warrant officer 5||Chief warrant officer 4||Chief warrant officer 3||Chief warrant officer 2||Warrant Officer 1
| United States Navy
|Chief warrant officer 5||Chief warrant officer 4||Chief warrant officer 3||Chief warrant officer 2||Warrant officer 1
| U.S. Coast Guard
|Chief warrant officer 4||Chief warrant officer 3||Chief warrant officer 2|
Warrant officers are specialists, accounting for only 8% of the officer corps. Warrant officers hold warrants from their service secretary and are specialists and experts in certain military technologies or capabilities. The lowest-ranking warrant officers serve under a warrant, but they receive commissions from the president upon promotion to chief warrant officer 2. They derive their authority from the same source as commissioned officers but remain specialists, in contrast to commissioned officers, who are generalists. There are no warrant officers in the Air Force or Space Force.
Warrant officers are typically non-commissioned officers before being selected, with the exception of the Army Aviation where any enlisted grade can apply for a warrant. Army Warrant officers attend the Army Warrant Officer Candidate School.
|Uniformed services pay grade||E-9||E-8||E-7||E-6||E-5||E-4||E-3||E-2||E-1|
| United States Army
|Senior Enlisted Advisor to the Chairman||Sergeant Major of the Army||Command sergeant major||Sergeant major||First sergeant||Master sergeant||Sergeant first class||Staff sergeant||Sergeant||Corporal||Specialist||Private first class||Private||Private
| United States Marine Corps
|Senior Enlisted Advisor to the Chairman||Sergeant Major of the Marine Corps||Sergeant major||Master gunnery sergeant||First sergeant||Master sergeant||Gunnery sergeant||Staff sergeant||Sergeant||Corporal||Lance corporal||Private first class||Private
| United States Navy
||Insignia pending||No insignia|
|Senior Enlisted Advisor to the Chairman||Master Chief Petty Officer of the Navy||Fleet/force master chief petty officer||Command master chief petty officer||Master chief petty officer||Command senior chief petty officer||Senior chief petty officer||Chief petty officer||Petty officer first class||Petty officer second class||Petty officer third class||Seaman||Seaman apprentice||Seaman recruit
| United States Air Force
|Senior enlisted advisor to the Chairman||Chief master sergeant of the Air Force||Senior Enlisted Advisor to the Chief of the National Guard Bureau||Command chief master sergeant||First sergeant||Chief master sergeant||First sergeant||Senior master sergeant||First sergeant||Master sergeant||Technical sergeant||Staff sergeant||Senior airman||Airman first class||Airman||Airman basic
| United States Space Force
|Senior Enlisted Advisor to the Chairman||Chief Master Sergeant of the Space Force||Chief master sergeant||Senior master sergeant||Master sergeant||Technical sergeant||Sergeant||Specialist 4||Specialist 3||Specialist 2||Specialist 1
| U.S. Coast Guard
|Master Chief Petty Officer of the Coast Guard||Master Chief Petty Officer of the Coast Guard Reserve||Command master chief petty officer||Master chief petty officer||Senior chief petty officer||Chief petty officer||Petty officer first class||Petty officer second class||Petty officer third class||Seaman||Seaman apprentice||Seaman recruit|
Enlisted personnel consist of 82% of the armed forces, serving as specialists and tactical leaders. Enlisted personnel are divided into three categories:
The rank of senior enlisted advisor is the highest rank in each service, serving as the primary advisors to their service secretary and service chief on enlisted matters. Prior to entering their service, enlisted personnel must complete their service's basic training. In the Army, after completing Basic Combat Training recruits then go to advanced individual training for their military occupational specialty. In the Marine Corps, after completing Recruit Training, marines attend the School of Infantry, going to the Infantry Training Battalion for infantry marines, with non-infantry marines completing Marine Combat Training before advancing to technical training for their military occupational specialty. In the Navy, after completing Recruit Training, sailors advance to their "A" schools to complete training for their rating. In the Air Force and Space Force, recruits complete combined Basic Military Training before going to technical training for their Air Force Specialty Codes. In the Coast Guard, after completing Recruit Training, sailors advance to their "A" schools to complete training for their rating.
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 landed in Normandy on D-Day. 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 in action. 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 Truman, allowing women to serve in the U.S. Armed Forces in fully integrated units during peacetime, 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 the 2000s, women can serve on U.S. combat ships, including in command roles. They are permitted to serve on submarines. Women can fly military aircraft and make up 2% of all pilots in the U.S. Military.
On 3 December 2015, U.S. defense secretary Ashton Carter announced that all military combat jobs 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. The decision gave military services until January 2016 to seek exceptions to the rule if they believe that certain jobs, such as machine gunners, should be restricted to men only. These restrictions were due in part to prior studies which stated that mixed gender units are less capable in combat. Physical requirements for all jobs remained unchanged, though. 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 June 1, 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 Department of Defense’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 2020, there are 229,933 women in the military, representing 17.2% of the total active duty force. Compared to 2010, the percentage of women enrolled as active duty members has increased by 2.8%.
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.
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.
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