The first F-35 Lightning II of the 33rd Fighter Wing arriving at Eglin AFB
The storming of Redoubt No. 10 in the Siege of Yorktown during the American Revolutionary War prompted Great Britain's government to begin negotiations, resulting in the Treaty of Paris and Great Britain's recognition of the United States as an independent state.
Emblem of the United States Marine Corps
An Air Force RQ-4 strategic reconnaissance aircraft
President Truman signs the National Security Act Amendment of 1949
General Andrew Jackson standing on the parapet of his makeshift defenses as his troops repulse attacking Highlanders during the defense of New Orleans, the final major and most one-sided battle of the War of 1812
U.S. Marines from the 31st Marine Expeditionary Unit training
An Air Force KC-46 Pegasus refuels a C-17A Globemaster III
Department of Defense organizational chart (December 2013)
The Battle of Gettysburg, the turning point of the American Civil War
Marines from the 15th Marine Expeditionary Unit depart USS Tarawa (LHA-1), using both a Landing Craft Utility and CH-53E "Super Stallion" helicopters, during amphibious operations in Kuwait, 2003.
An Air Force A-10 demonstrating close air support at Nellis AFB
2008 OSD organizational chart
Army soldiers in 1890
Maj. Samuel Nicholas, first Commandant of the Marine Corps, was nominated to lead the Continental Marines by John Adams in November 1775.
Test launch of a LGM-30 Minuteman Intercontinental Ballistic Missile from Vandenberg AFB
Joint Chiefs of Staff/Joint Staff organizational chart
U.S. Army troops assaulting a German bunker in France, c. 1918
British and U.S. troops garrisoned aboard Hornet and Penguin exchanging small arms musket fire with Tristan da Cuna in the background during the final engagement between British and U.S. forces in the War of 1812
Combined Air Operations Center at Al Udeid Air Base
Combatant command areas of responsibility
U.S. soldiers hunting for Japanese infiltrators during the Bougainville Campaign
The Final Stand at Bladensburg, Maryland, 24 August 1814
Roundels that have appeared on U.S. military aircraft
1.) 5/1917–2/1918
2.) 2/1918–8/1919
3.) 8/1919–5/1942
4.) 5/1942–6/1943
5.) 6/1943–9/1943
6.) 9/1943–1/1947
7.) 1/1947–
Defense Spending as a Percent of GDP (1792–2017)
U.S. Army soldiers observing an atomic bomb test of Operation Buster-Jangle at the Nevada Test Site during the Korean War
Five USMC privates with fixed bayonets, and their NCO with his sword at the Washington Navy Yard, 1864
The SR-71 Blackbird was a Cold War reconnaissance plane.
Total United States Defense Outlays 1962–2024, $millions (2019-2024 estimated)
US tanks and Soviet tanks at Checkpoint Charlie, 1961
Georges Scott, American Marines in Belleau Wood, 1918
The F-117 Nighthawk was a stealth attack aircraft (retired from service in April 2008).
Defense Intelligence Agency
A U.S. Army infantry patrol moving up to assault the last North Vietnamese Army position at Dak To, South Vietnam during Operation Hawthorne
Former French Foreign Legion Lieutenant, and U.S. Marine Corps officer Peter J. Ortiz, who served in the European theater, often behind enemy lines
A row of Douglas C-54 Skymasters during the Berlin Airlift in 1949
National Security Agency
U.S. Army soldiers preparing to take La Comandancia in the El Chorrillo neighborhood of Panama City during Operation Just Cause
Photograph of the Marine Corps War Memorial, which depicts the second U.S. flag-raising atop Mount Suribachi, on Iwo Jima. The memorial is modeled on Joe Rosenthal's famous Raising the Flag on Iwo Jima.
Various Air Force personnel pose during the Air Force's 74th birthday celebration at the Pentagon, September 17, 2021.
National Geospatial-Intelligence Agency
M1 Abrams tanks moving out before the Battle of Al Busayyah during the Gulf War
F4U Corsairs providing close air support to Marines of the 1st Marine Division fighting Chinese forces in North Korea, December 1950
Organization of the United States Air Force within the Department of Defense
National Reconnaissance Office
Iraqi tanks destroyed by Task Force 1-41 Infantry during the Gulf War, February 1991
U.S. Marines of "G" Company, 2nd Battalion, 7th Marines in action during Operation Allen Brook in South Vietnam, 1968
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Department of the Army
U.S. Army Rangers taking part in a raid during an operation in Nahr-e Saraj, Afghanistan
Beirut Memorial at Marine Corps Base Camp Lejeune
Pararescuemen and a simulated "survivor" watch as an HH-60G Pave Hawk helicopter comes in for a landing
Department of the Navy
U.S. Army soldiers with the 2nd Battalion, 327th Infantry Regiment, 101st Airborne Division returning fire during a firefight with Taliban forces in Barawala Kalay Valley in Kunar province, Afghanistan, March 2011
U.S. Marines from 1st Battalion, 7th Marines entering a palace in Baghdad in 2003
U.S. Air Force trainee demonstrating a butt stroke on a strike dummy as part of Basic Military Training.
Department of the Air Force
Organization of the United States Army within the Department of Defense
U.S. Marines dismounting from an Assault Amphibious Vehicle in Djibouti
USAF Airmen training at Lackland AFB
U.S. Army
U.S. Army organization chart
Organization of the United States Marine Corps
A-10 Thunderbolt II ground-attack aircraft
U.S. Marine Corps
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Marine Raiders conducting CQB training
B-2 Spirit stealth bomber
U.S. Navy
U.S. Army soldiers of the 1st Battalion, 175th Infantry Regiment, Maryland Army National Guard conducting an urban cordon and search exercise as part of the army readiness and training evaluation program in the mock city of Balad at Fort Dix, New Jersey
Opha Johnson (far right) in 1946, with Katherine Towle (far left). They are looking at Opha Johnson's uniform being worn by PFC Muriel Albert.
A C-17 Globemaster III, the USAF's newest and most versatile transport plane
U.S. Air Force
U.S. soldiers from the 6th Infantry Regiment taking up positions on a street corner during a foot patrol in Ramadi, Iraq
Two of the first female graduates of the School of Infantry-East's Infantry Training Battalion course, 2013
E-3 Sentry airborne warning and control system
U.S. Space Force
The 1st Cavalry Division's combat aviation brigade performing a mock charge with the horse detachment
Marine recruits at Marine Corps Recruit Depot San Diego
F-22 Raptor stealth air superiority fighter
U.S. Army Special Forces soldiers from the 3rd Special Forces Group patrolling a field in the Gulistan district of Farah, Afghanistan
U.S. Marines in training
KC-10 Extender tri-jet air-to-air tanker
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An illustration of U.S. Marines in various uniform setups. From left to right: A U.S. Marine in a Marine Corps Combat Utility Uniform with full combat load circa 2003, a U.S. Marine in a (full) blue dress uniform, a U.S. Marine officer in a service uniform, and a U.S. Marine general in an evening dress uniform.
An MC-12W Liberty at Beale AFB
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The Eagle, Globe and Anchor along with the U.S. flag, the Marine Corps flag and the Commandant's flag
MQ-9 unmanned aerial vehicle
U.S. Army Rangers practicing fast roping techniques from an MH-47 during an exercise at Fort Bragg
A recruiting poster making use of the "Teufel Hunden" [sic] nickname
Lockheed U-2 spy plane
A trainer with Company A, 1st Battalion 502nd Infantry Regiment, Task Force Strike, 101st Airborne Division assisting Iraqi army ranger students during a room clearing drill at Camp Taji, Iraq on 18 July 2016
Marines training in martial arts
RQ-170 Sentinel stealth unmanned aerial vehicle reconnaissance aircraft
U.S. Army soldiers familiarizing with the latest INSAS 1B1 during exercise Yudh Abhyas 2015
Marines firing MEU(SOC) pistols while garrisoned aboard a ship
VC-25A (Air Force One)
A Lockheed Martin Terminal High Altitude Area Defense (THAAD) system used for ballistic missile protection
Marine Amphibious Assault Vehicles emerge from the surf onto the sand of Freshwater Beach, Australia
A WC-130J Hercules from the 53rd Weather Reconnaissance Squadron
A U.S. soldier on patrol in Iraq with the support of a Humvee vehicle
Marine parachutists jumping from an MV-22 Osprey at 10,000 feet
An unarmed Minuteman III ICBM shoots out of the silo during an operational test launch
3rd Infantry Division soldiers manning an M1A1 Abrams in Iraq
A Marine Corps F-35B, the vertical-landing version of the F-35 Lightning II multirole fighter landing aboard USS Wasp (LHD-1)
The 2020 Army Greens uniform
Assault Amphibious Vehicles approaching the well deck of USS Bonhomme Richard (LHD-6)
An element of the 18th Infantry Regiment, wearing ASUs, representing the United States at the 2010 Victory Day commemoration in Moscow
A Marine and sailor training with rifles in Iraq
The Ranger Honor Platoon marching in their tan berets and former service uniform
A soldier from the 1st Infantry Regiment provides security for a joint Army-Marine patrol in Rawa in 2006. The shoulder sleeve insignia has the logo of the 2nd Marine Division.
Marines unloading CH-46 Sea Knight helicopters from an Air Force C-5 Galaxy

Originally created on August 1, 1907 as a part of the United States Army Signal Corps, the USAF was established as a separate branch of the United States Armed Forces in 1947 with the enactment of the National Security Act of 1947.

- United States Air Force

The United States Air Force is a military service branch organized within the Department of the Air Force, one of the three military departments of the Department of Defense.

- United States Air Force

The U.S. Army is a uniformed service of the United States and is part of the Department of the Army, which is one of the three military departments of the Department of Defense.

- United States Army

Development of tactics, technique, and equipment used by amphibious landing forces in coordination with the Army and Air Force; and

- United States Marine Corps

Such other duties as the President or Department of Defense may direct.

- United States Marine Corps

On 26 July 1947, Truman signed the National Security Act of 1947, which set up a unified military command known as the "National Military Establishment", as well as creating the Central Intelligence Agency, the National Security Council, National Security Resources Board, United States Air Force (formerly the Army Air Forces) and the Joint Chiefs of Staff.

- United States Department of Defense

1) the Department of the Army, within which the United States Army is organized.

- United States Department of Defense

In the Pacific War, U.S. Army soldiers participated alongside the United States Marine Corps in capturing the Pacific Islands from Japanese control.

- United States Army

2) the Department of the Navy, within which the United States Navy and the United States Marine Corps are organized.

- United States Department of Defense

Two years after World War II, the Army Air Forces separated from the army to become the United States Air Force in September 1947.

- United States Army

Prior to 1947, the responsibility for military aviation was shared between the Army Air Forces and its predecessor organizations (for land-based operations), the Navy (for sea-based operations from aircraft carriers and amphibious aircraft), and the Marine Corps (for close air support of Marine Corps operations).

- United States Air Force
The first F-35 Lightning II of the 33rd Fighter Wing arriving at Eglin AFB

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The Joint Chiefs of Staff in December 2020.

United States Armed Forces

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The United States Armed Forces are the military forces of the United States.

The United States Armed Forces are the military forces of the United States.

The Joint Chiefs of Staff in December 2020.
Organization of the military services and military departments within the Department of Defense
Logo of the United States Army
U.S. Army Soldiers with 2nd Battalion, 327th Infantry Regiment, 101st Airborne Division return fire during a firefight with Taliban forces in Barawala Kalay Valley in Kunar province, Afghanistan on 31 March 2011.
U.S. Army M1A2 Abrams tanks from the 3rd Armored Cavalry Regiment maneuver in the streets as they conduct a combat patrol in the city of Tall Afar, Iraq, on Feb. 3, 2005.
Eagle, Globe, and Anchor
U.S. Marines with India Company, Battalion Landing Team, 3rd Battalion, 2nd Marine Regiment, 22nd Marine Expeditionary Unit run on the beach during an amphibious assault demonstration.
A U.S. Marine Corps MV-22 Osprey tiltrotor aircraft attached to VMX-22 prepares to land on the amphibious assault ship USS America (LHA-6) in the Pacific Ocean.
Logo of the United States Navy
USS John C. Stennis (CVN-74) and Carrier Strike Group 3 underway with Republic of Korea Navy ships.
USS Nebraska (SSBN-739), an 
 ballistic missile submarine underway in the Atlantic Ocean.
United States Air Force Symbol
F-22A Raptors in flight.
U.S. Air Force B-2A Spirit stealth bombers flying with Royal Air Force F-35B Lightning II stealth fighters.
Space Force Delta
The Sodium Guidestar at the Directed Energy Directorate's Starfire Optical Range for real-time, high-fidelity tracking and imaging of satellites.
Boeing X-37B spaceplane after deorbiting and landing.
Service mark of the United States Coast Guard
USCGC Hamilton and TCG Turgutries in the Black Sea, April 30, 2021.
Coast Guard Reserve Port Security boat on patrol
Unified combatant commands areas of responsibility
A pie chart showing global military expenditures by country for 2019, in US$ billions, according to SIPRI
Sergeant Leigh Ann Hester, awarded the Silver Star for direct combat
ADM Linda L. Fagan June 2021.

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.