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.
President Truman signs the National Security Act Amendment of 1949
An Air Force RQ-4 strategic reconnaissance aircraft
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
Seal of the National Military Establishment (1947–1949)
Department of Defense organizational chart (December 2013)
An Air Force KC-46 Pegasus refuels a C-17A Globemaster III
The Battle of Gettysburg, the turning point of the American Civil War
Donald Rumsfeld is sworn-in as Secretary of Defense by Associate Supreme Court Justice Potter Stewart as U.S. President Gerald R. Ford and Chairman of The Joint Chiefs of Staff General George S. Brown watch at The Pentagon on November 20, 1975.
2008 OSD organizational chart
An Air Force A-10 demonstrating close air support at Nellis AFB
Army soldiers in 1890
Department of Defense organizational chart (December 2013)
Joint Chiefs of Staff/Joint Staff organizational chart
Test launch of a LGM-30 Minuteman Intercontinental Ballistic Missile from Vandenberg AFB
U.S. Army troops assaulting a German bunker in France, c. 1918
Combatant command areas of responsibility
Combined Air Operations Center at Al Udeid Air Base
U.S. soldiers hunting for Japanese infiltrators during the Bougainville Campaign
Defense Spending as a Percent of GDP (1792–2017)
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–
U.S. Army soldiers observing an atomic bomb test of Operation Buster-Jangle at the Nevada Test Site during the Korean War
Total United States Defense Outlays 1962–2024, $millions (2019-2024 estimated)
The SR-71 Blackbird was a Cold War reconnaissance plane.
US tanks and Soviet tanks at Checkpoint Charlie, 1961
Defense Intelligence Agency
The F-117 Nighthawk was a stealth attack aircraft (retired from service in April 2008).
A U.S. Army infantry patrol moving up to assault the last North Vietnamese Army position at Dak To, South Vietnam during Operation Hawthorne
National Security Agency
A row of Douglas C-54 Skymasters during the Berlin Airlift in 1949
U.S. Army soldiers preparing to take La Comandancia in the El Chorrillo neighborhood of Panama City during Operation Just Cause
National Geospatial-Intelligence Agency
Various Air Force personnel pose during the Air Force's 74th birthday celebration at the Pentagon, September 17, 2021.
M1 Abrams tanks moving out before the Battle of Al Busayyah during the Gulf War
National Reconnaissance Office
Organization of the United States Air Force within the Department of Defense
Iraqi tanks destroyed by Task Force 1-41 Infantry during the Gulf War, February 1991
Department of the Army
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U.S. Army Rangers taking part in a raid during an operation in Nahr-e Saraj, Afghanistan
Department of the Navy
Pararescuemen and a simulated "survivor" watch as an HH-60G Pave Hawk helicopter comes in for a landing
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
Department of the Air Force
U.S. Air Force trainee demonstrating a butt stroke on a strike dummy as part of Basic Military Training.
Organization of the United States Army within the Department of Defense
U.S. Army
USAF Airmen training at Lackland AFB
U.S. Army organization chart
U.S. Marine Corps
A-10 Thunderbolt II ground-attack aircraft
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U.S. Navy
B-2 Spirit stealth bomber
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. Air Force
A C-17 Globemaster III, the USAF's newest and most versatile transport plane
U.S. soldiers from the 6th Infantry Regiment taking up positions on a street corner during a foot patrol in Ramadi, Iraq
U.S. Space Force
E-3 Sentry airborne warning and control system
The 1st Cavalry Division's combat aviation brigade performing a mock charge with the horse detachment
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
KC-10 Extender tri-jet air-to-air tanker
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An MC-12W Liberty at Beale AFB
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MQ-9 unmanned aerial vehicle
U.S. Army Rangers practicing fast roping techniques from an MH-47 during an exercise at Fort Bragg
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
RQ-170 Sentinel stealth unmanned aerial vehicle reconnaissance aircraft
U.S. Army soldiers familiarizing with the latest INSAS 1B1 during exercise Yudh Abhyas 2015
VC-25A (Air Force One)
A Lockheed Martin Terminal High Altitude Area Defense (THAAD) system used for ballistic missile protection
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
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
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 United States secretary of defense (SecDef) is the head of the United States Department of Defense, the executive department of the U.S. Armed Forces, and is a high ranking member of the federal cabinet.

- United States Secretary of Defense

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 Department of Defense is headed by the secretary of defense, a cabinet-level head who reports directly to the president of the United States.

- United States Department of Defense

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 Air Force through the Department of the Air Force is headed by the civilian Secretary of the Air Force, who reports to the Secretary of Defense and is appointed by the President with Senate confirmation.

- 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

Subject only to the orders of the president, the secretary of defense is in the chain of command and exercises command and control, for both operational and administrative purposes, over all service branches administered by the Department of Defense – the Army, Marine Corps, Navy, Air Force, and Space Force – as well as the Coast Guard when its command and control is transferred to the Department of Defense.

- United States Secretary of Defense

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

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

The U.S. Army is led by a civilian secretary of the Army, who has the statutory authority to conduct all the affairs of the army under the authority, direction and control of the secretary of defense.

- United States Army

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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.

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.