The first F-35 Lightning II of the 33rd Fighter Wing arriving at Eglin AFB
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
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)
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
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
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
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)
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)
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
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
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
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
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
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. 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
U.S. Marines dismounting from an Assault Amphibious Vehicle in Djibouti
USAF Airmen training at Lackland AFB
U.S. Army
Organization of the United States Marine Corps
A-10 Thunderbolt II ground-attack aircraft
U.S. Marine Corps
Marine Raiders conducting CQB training
B-2 Spirit stealth bomber
U.S. Navy
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
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
Marine recruits at Marine Corps Recruit Depot San Diego
F-22 Raptor stealth air superiority fighter
U.S. Marines in training
KC-10 Extender tri-jet air-to-air tanker
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
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
A recruiting poster making use of the "Teufel Hunden" [sic] nickname
Lockheed U-2 spy plane
Marines training in martial arts
RQ-170 Sentinel stealth unmanned aerial vehicle reconnaissance aircraft
Marines firing MEU(SOC) pistols while garrisoned aboard a ship
VC-25A (Air Force One)
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
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
A Marine Corps F-35B, the vertical-landing version of the F-35 Lightning II multirole fighter landing aboard USS Wasp (LHD-1)
Assault Amphibious Vehicles approaching the well deck of USS Bonhomme Richard (LHD-6)
A Marine and sailor training with rifles in Iraq
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

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

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

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

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.

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.

United States Army

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Land service branch of the United States Armed Forces.

Land service branch of the United States Armed Forces.

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.
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
The Battle of Gettysburg, the turning point of the American Civil War
Army soldiers in 1890
U.S. Army troops assaulting a German bunker in France, c. 1918
U.S. soldiers hunting for Japanese infiltrators during the Bougainville Campaign
U.S. Army soldiers observing an atomic bomb test of Operation Buster-Jangle at the Nevada Test Site during the Korean War
US tanks and Soviet tanks at Checkpoint Charlie, 1961
A U.S. Army infantry patrol moving up to assault the last North Vietnamese Army position at Dak To, South Vietnam during Operation Hawthorne
U.S. Army soldiers preparing to take La Comandancia in the El Chorrillo neighborhood of Panama City during Operation Just Cause
M1 Abrams tanks moving out before the Battle of Al Busayyah during the Gulf War
Iraqi tanks destroyed by Task Force 1-41 Infantry during the Gulf War, February 1991
U.S. Army Rangers taking part in a raid during an operation in Nahr-e Saraj, Afghanistan
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
Organization of the United States Army within the Department of Defense
U.S. Army organization chart
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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
U.S. soldiers from the 6th Infantry Regiment taking up positions on a street corner during a foot patrol in Ramadi, Iraq
The 1st Cavalry Division's combat aviation brigade performing a mock charge with the horse detachment
U.S. Army Special Forces soldiers from the 3rd Special Forces Group patrolling a field in the Gulistan district of Farah, Afghanistan
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U.S. Army Rangers practicing fast roping techniques from an MH-47 during an exercise at Fort Bragg
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
U.S. Army soldiers familiarizing with the latest INSAS 1B1 during exercise Yudh Abhyas 2015
A Lockheed Martin Terminal High Altitude Area Defense (THAAD) system used for ballistic missile protection
A U.S. soldier on patrol in Iraq with the support of a Humvee vehicle
3rd Infantry Division soldiers manning an M1A1 Abrams in Iraq
The 2020 Army Greens uniform
An element of the 18th Infantry Regiment, wearing ASUs, representing the United States at the 2010 Victory Day commemoration in Moscow
The Ranger Honor Platoon marching in their tan berets and former service uniform

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.

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

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

Emblem of the United States Navy

United States Navy

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Maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States.

Maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States.

Emblem of the United States Navy
USS Constellation vs L'Insurgente during the Quasi-War
USS Constitution vs HMS Guerriere during the War of 1812
A carte de visite of a U.S. Navy lieutenant during the Civil War
The Great White Fleet demonstrating U.S. naval power in 1907; it was proof that the U.S. Navy had blue-water capability.
Columbia, personification of the United States, wearing a warship bearing the words "World Power" as her "Easter bonnet" on the cover of Puck, 6 April 1901
Battleship USS Idaho (BB-42) shelling Okinawa on 1 April 1945.
USS George Washington (SSBN-598), a ballistic missile submarine
U.S. Navy officers aboard the aircraft carrier USS Abraham Lincoln (CVN-72) monitor defense systems during early 2010s maritime security operations exercises
U.S. Navy patrol boat near Kuwait Naval Base in 2009
The amphibious assault ship USS America (LHA-6), launched in 2012.
Organization of the United States Navy within the Department of Defense
Simplified flowchart of the U.S. Navy command structure
Areas of responsibility for each of the United States Navy fleets. Tenth Fleet serves as the numbered fleet for U.S. Fleet Cyber Command and therefore is not shown.
USS Kitty Hawk (CV-63) docking at the U.S. Navy base in Yokosuka, Japan
A Marine F/A-18 from VMFA-451 preparing to launch from USS Coral Sea (CV-43)
A U.S. Coast Guard helicopter preparing to land on the flight deck of the amphibious assault ship USS Wasp (LHD-1)
Navy SEALs at one of the entrances to the Zhawar Kili cave complex
U.S. Navy warrant officer specialty insignias
Map of naval bases in the United States
Underwater Demolition Team members using the casting technique from a speeding boat
Combat Camera Underwater Photo Team – A U.S. Navy diver during underwater photography training off the coast of Guantanamo Bay
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USS Nimitz, a
USS Bataan (LHD-5), a
USS San Antonio (LPD-17), a
USS Port Royal (CG-73), a
USS Zumwalt (DDG-1000), a Zumwalt-class stealth guided missile destroyer
USS Independence (LCS-2), a Littoral combat ship
USS Freedom (LCS-1) underway in special naval camouflage
USS Warrior (MCM-10) in port
USS Typhoon (PC-5) departing Naval Amphibious Base Little Creek in Virginia
USS Kentucky (SSBN-737), an ballistic missile submarine
USS Virginia (SSN-774), a attack submarine
Four Navy F/A-18F Super Hornets
U.S. Navy MH-60R maritime strike helicopter assigned to the HSM-78 Blue Hawks aboard the carrier USS Carl Vinson
Aviation Ordnancemen loading GBU-12 bombs in 2005
U.S. naval jack
First navy jack
Naval Aviator Badge
Submarine Officer badge
Surface Warfare Officer Insignia

The U.S. Navy is part of the Department of the Navy, alongside the U.S. Marine Corps, which is its coequal sister service.

The Department of the Navy is itself a military department of the Department of Defense, which is headed by the Secretary of Defense.

Naval fixed-wing aircraft employ much of the same weapons as the United States Air Force for both air-to-air and air-to-surface combat.

Seal of National Military Establishment (1947–1949), which was later renamed the Department of Defense.

National Security Act of 1947

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Law enacting major restructuring of the United States government's military and intelligence agencies following World War II.

Law enacting major restructuring of the United States government's military and intelligence agencies following World War II.

Seal of National Military Establishment (1947–1949), which was later renamed the Department of Defense.
Seal of the Department of the Air Force, established by the National Security Act of 1947.
President Truman signs the National Security Act Amendment of 1949. Secretary of Defense Louis A. Johnson leans over the desk. Behind him is Admiral Louis Denfeld, General Omar N. Bradley, and General Hoyt Vandenberg.
The first page of the National Security Act of 1947.
The last page of the National Security Act of 1947. Signed by Speaker of the House of Representatives Joseph W. Martin, Jr. (R-MA), President of the Senate pro tempore Arthur H. Vandenberg (R-MI), and President Harry S. Truman.
President Truman signed the National Security Act of 1947 on board this VC-54C Presidential transport, the first aircraft used for the role of Air Force One.

The act merged the Department of the Army (renamed from the Department of War), the Department of the Navy, and the newly established Department of the Air Force (DAF) into the National Military Establishment (NME).

The act also created the position of the secretary of defense as the head of the NME It established the United States Air Force under the DAF, which worked to separate the Army Air Forces into its own service.

It also protected the Marine Corps as an independent service under the Department of the Navy.