The first F-35 Lightning II of the 33rd Fighter Wing arriving at Eglin AFB
AAF Shoulder Sleeve Insignia
An Air Force RQ-4 strategic reconnaissance aircraft
General of the Army Henry H. ("Hap") Arnold
President Truman signs the National Security Act Amendment of 1949
An Air Force KC-46 Pegasus refuels a C-17A Globemaster III
USAAF recruitment poster
Department of Defense organizational chart (December 2013)
An Air Force A-10 demonstrating close air support at Nellis AFB
Tuskegee Airmen War bonds poster
2008 OSD organizational chart
Test launch of a LGM-30 Minuteman Intercontinental Ballistic Missile from Vandenberg AFB
1943 portrait of WAC air controller
Joint Chiefs of Staff/Joint Staff organizational chart
Combined Air Operations Center at Al Udeid Air Base
AAF Training Command patch
Combatant command areas of responsibility
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–
USAAF recruiting poster
Defense Spending as a Percent of GDP (1792–2017)
The SR-71 Blackbird was a Cold War reconnaissance plane.
USAAF insignia from July 1943 to January 1947
Total United States Defense Outlays 1962–2024, $millions (2019-2024 estimated)
The F-117 Nighthawk was a stealth attack aircraft (retired from service in April 2008).
B-17G Fortresses of the 306th Bomb Group
Defense Intelligence Agency
A row of Douglas C-54 Skymasters during the Berlin Airlift in 1949
P-51 Mustang of 361st Fighter Group, 1944
National Security Agency
Various Air Force personnel pose during the Air Force's 74th birthday celebration at the Pentagon, September 17, 2021.
Taylorcraft L-2
National Geospatial-Intelligence Agency
Organization of the United States Air Force within the Department of Defense
C-47 of the 438th Troop Carrier Group
National Reconnaissance Office
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USAAF AT-6Cs near Luke Field, 1943
Department of the Army
Pararescuemen and a simulated "survivor" watch as an HH-60G Pave Hawk helicopter comes in for a landing
UC-64 Norseman
Department of the Navy
U.S. Air Force trainee demonstrating a butt stroke on a strike dummy as part of Basic Military Training.
General Carl A. Spaatz
Department of the Air Force
USAF Airmen training at Lackland AFB
Medal of Honor recipient Major Richard Bong in Officer's Service Dress
U.S. Army
A-10 Thunderbolt II ground-attack aircraft
Awards ceremony at RAF Debden, April 1944, illustrating varying shades of olive drab and the M-1944 "Ike jacket". Light shade 33 on left, dark shade 51 on right. Trousers are shade 33, khaki shade 1, and drab shade 54. The three combinations at right are "pinks and greens".
U.S. Marine Corps
B-2 Spirit stealth bomber
At the AAF School of Air Evacuation at Bowman Field, Ky., student flight nurses learned how to handle patients with the aid of a mock-up fuselage of a Douglas C-47 transport.
U.S. Navy
A C-17 Globemaster III, the USAF's newest and most versatile transport plane
Female service dress in OD shade 33 at Randolph Field, 1944
U.S. Air Force
E-3 Sentry airborne warning and control system
USAAF flight crew
U.S. Space Force
F-22 Raptor stealth air superiority fighter
First Air Force
KC-10 Extender tri-jet air-to-air tanker
Second Air Force
An MC-12W Liberty at Beale AFB
Third Air Force
MQ-9 unmanned aerial vehicle
Fourth Air Force
Lockheed U-2 spy plane
Fifth Air Force
RQ-170 Sentinel stealth unmanned aerial vehicle reconnaissance aircraft
Sixth Air Force
VC-25A (Air Force One)
Seventh Air Force
A WC-130J Hercules from the 53rd Weather Reconnaissance Squadron
Eighth Air Force
An unarmed Minuteman III ICBM shoots out of the silo during an operational test launch
Ninth Air Force
Tenth Air Force
Eleventh Air Force
Twelfth Air Force
Thirteenth Air Force
Fourteenth Air Force
Fifteenth Air Force
Twentieth Air Force

It was created on 20 June 1941 as successor to the previous United States Army Air Corps and is the direct predecessor of the United States Air Force, today one of the six armed forces of the United States.

- United States Army Air Forces

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

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

In practice, the U.S. Army Air Forces (USAAF) was virtually independent of the Army during World War II, and in virtually every way functioned as an independent service branch, but airmen still pressed for formal independence.

- United States Air Force

As all 48 states then part of the Union were contained within the contiguous United States, the term "Zone of the Interior" for the First through Fourth Air Forces' areas of assignment was the Second World War's term for what is called "CONUS" by today's United States Department of Defense in the 21st century.

- United States Army Air Forces
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 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 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.

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

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.