A report on United States Department of Defense

President Truman signs the National Security Act Amendment of 1949
Department of Defense organizational chart (December 2013)
2008 OSD organizational chart
Joint Chiefs of Staff/Joint Staff organizational chart
Combatant command areas of responsibility
Defense Spending as a Percent of GDP (1792–2017)
Total United States Defense Outlays 1962–2024, $millions (2019-2024 estimated)
Defense Intelligence Agency
National Security Agency
National Geospatial-Intelligence Agency
National Reconnaissance Office
Department of the Army
Department of the Navy
Department of the Air Force
U.S. Army
U.S. Marine Corps
U.S. Navy
U.S. Air Force
U.S. Space Force

Executive branch department of the federal government charged with coordinating and supervising all agencies and functions of the government directly related to national security and the United States Armed Forces.

- United States Department of Defense

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United States Secretary of Defense

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Seal of the National Military Establishment (1947–1949)
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.
Department of Defense organizational chart (December 2013)

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.

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 Joint Chiefs of Staff in December 2020.

Joint Chiefs of Staff

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The Joint Chiefs of Staff in December 2020.
United States Secretary of Defense Harold Brown and United States Deputy Secretary of Defense Charles W. Duncan Jr with Chairman of the Joint Chiefs of Staff General George S. Brown and the other members of the Joint Chiefs of Staff at the Pentagon in 1977
Joint Chiefs of Staff meeting (circa 1943). From left to right are: Gen. Henry H. Arnold, Chief of the Army Air Forces; Adm. William D. Leahy, Chief of Staff to the Commander in Chief of the Army and Navy; Adm. Ernest J. King, Commander in Chief, U.S. Fleet and Chief of Naval Operations; and Gen. George C. Marshall, Chief of Staff of the United States Army.
The Joint Chiefs of Staff in 1959.
The Joint Chiefs of Staff in an annual meeting with the commanders of unified and specified command in the JCS meeting room, also known as "The Tank" on January 15, 1981.
The Joint Chiefs of Staff in 2002
The Joint Staff Organization Chart as of March 2018
Members of the Joint Chiefs of Staff during a press conference at The Pentagon with Secretary of Defense. From left to right are Army Vice Chief of Staff General Richard A. Cody, Chief of Naval Operations Admiral Vern Clark, Chairman of the Joint Chiefs of Staff, U.S. Air Force General Richard B. Myers, U.S. Secretary of Defense Donald Rumsfeld, Air Force Chief of Staff General John P. Jumper and Commandant of the Marine Corps General Michael Hagee. In the absence of the Chairman of the Joint Chiefs of Staff or the Service Chief, the Vice Chairman of the Joint Chiefs of Staff and the Vice Service Chief will replace its presence at an important event.
Members of The Joint Chiefs of Staff with U.S. Secretary of Defense in 1973.
The Joint Chiefs of Staff (seated) and the directors of the Joint Staff directorates (standing), November 1989.
The Joint Chiefs of Staff during its early days in 1949.
Members of the Joint Chiefs of Staff at The Pentagon in 1958.
The Joint Chiefs of Staff in 1961.
The Joint Chiefs of Staff in 1968.
The Joint Chiefs of Staff in 1971.
The Joint Chiefs of Staff in 1977.
Members of the Joint Chiefs of Staff with President-Elect Jimmy Carter and Secretary of Defense Donald Rumsfeld on December 17, 1976.
Members of the Joint Chiefs of Staff during a cabinet meeting in the White House in 1977
The Joint Chiefs of Staff in 1981.
Members of the Joint Chiefs of Staff during President Ronald Reagan Inaugural Parade in January 20, 1981.
The Joint Chiefs of Staff in 1983.
The Joint Chiefs of Staff in 1986.
The Joint Chiefs of Staff in 2001.
Members of the Joint Chiefs of Staff render a salute for the late President Ronald Reagan at Andrews Air Force Base in 2004.
Members of the Joint Chiefs of Staff at Andrews Air Force Base during a funeral service ceremony for the late President Gerald Ford on December 26, 2006.
The Joint Chiefs of Staff at the Senate Armed Services Committee testimony in The Capitol Hill 2010.
The Joint Chiefs of Staff in 2017.

The Joint Chiefs of Staff (JCS) is the body of the most senior uniformed leaders within the United States Department of Defense, that advises the president of the United States, the secretary of defense, the Homeland Security Council and the National Security Council on military matters.

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 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.

Bird's eye view of DIA HQ from the Potomac in Washington, DC

Defense Intelligence Agency

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Bird's eye view of DIA HQ from the Potomac in Washington, DC
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Igor Sutyagin
Ana Montes
Skinny Puppy billed DIA for allegedly using its music in torture.
Robert McNamara, founder of DIA
A U-2 reconnaissance plane discovered Soviet missiles in Cuba based on a flight path selected by DIA analysts
DIA sets intelligence requirements for numerous installations, such as T-AGM-23, which checks compliance with strategic arms treaties worldwide.
President Ronald Reagan unveiling the first copy of Soviet Military Power, one of DIA's serialized publications.
In the 1980s, DIA moved into the newly built Defense Intelligence Agency Headquarters (seen here in 1988), which now represents only one wing of the sprawling complex.
President George H.W. Bush being briefed by DIA during the US invasion of Panama
Defense Clandestine Service recruitment poster
DIA's memorial wall
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Defense Intelligence Agency Badge
Defense Intelligence Agency Special Agent Badge

The Defense Intelligence Agency (DIA) is an intelligence agency and combat support agency of the United States Department of Defense, specializing in defense and military intelligence.

Central Intelligence Agency

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Civilian foreign intelligence service of the federal government of the United States, officially tasked with gathering, processing, and analyzing national security information from around the world, primarily through the use of human intelligence (HUMINT) and performing covert actions.

Civilian foreign intelligence service of the federal government of the United States, officially tasked with gathering, processing, and analyzing national security information from around the world, primarily through the use of human intelligence (HUMINT) and performing covert actions.

William Joseph Burns, the current Director of the Central Intelligence Agency
Chart showing the organization of the Central Intelligence Agency.
The 113 stars on the CIA Memorial Wall in the original CIA headquarters, each representing a CIA officer killed in action
CIA director Allen Dulles on the cover of Time magazine, 1953
When democratically elected President Jacobo Árbenz attempted a modest redistribution of land, he was overthrown in the 1954 CIA Guatemalan coup d'état
President Kennedy presents the National Security Medal to Allen Dulles, November 28, 1961
Suspended from the ceiling of the glass-enclosed atrium: three models of the U-2, Lockheed A-12, and D-21 drone. These models are exact replicas at one-sixth scale of the real planes. All three had photographic capabilities. The U-2 was one of the first espionage planes developed by the CIA. The A-12 set unheralded flight records. The D-21 drone was one of the first crewless aircraft ever built. Lockheed Martin Corporation donated all three models to the CIA.
The CIA recruited Sam Giancana (pictured), Santo Trafficante and other mobsters to assassinate Fidel Castro.
Lockheed U-2 "Dragon Lady", the first generation of near-space reconnaissance aircraft
Early CORONA/KH-4B imagery IMINT satellite
The USAF's SR-71 Blackbird was developed from the CIA's A-12 OXCART.
Operation Condor participants. Green: active members. Blue: collaborator (United States).
Critics assert that funding the Afghan mujahideen (Operation Cyclone) played a role in causing the September 11 attacks.
The CIA prepared a series of leaflets announcing bounties for those who turned in or denounced individuals suspected of association with the Taliban or al Qaeda.
US Special Forces help Northern Alliance troops away from a CIA-operated MI-17 Hip helicopter at Bagram Airbase, 2002
Former CIA director Robert Gates meets with Russian Minister of Defense and ex-KGB officer Sergei Ivanov, 2007
President Gerald Ford meets with CIA Director-designate George H. W. Bush, December 17, 1975
Former CIA deputy director Michael Morell (left) apologized to Colin Powell for the CIA's erroneous assessments of Iraq's WMD programs.

This Directorate was created in an attempt to end years of rivalry over influence, philosophy, and budget between the United States Department of Defense (DOD) and the CIA.

National Security Agency

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Black Chamber cryptanalytic work sheet for solving Japanese diplomatic cipher, 1919
Protesters against NSA data mining in Berlin wearing Chelsea Manning and Edward Snowden masks
PRISM: a clandestine surveillance program under which the NSA collects user data from companies like Microsoft and Facebook.
Paul M. Nakasone, the director of the NSA.
Behind the Green Door – Secure communications room with separate computer terminals for access to SIPRNET, GWAN, NSANET, and JWICS
Headquarters at Fort Meade circa 1950s
National Security Agency headquarters in Fort Meade, 2013
Due to massive amounts of data processing, NSA is the largest electricity consumer in Maryland.
Buckley Space Force Base in Colorado
Utah Data Center
RAF Menwith Hill has the largest NSA presence in the United Kingdom.
FROSTBURG was the NSA's first supercomputer, used from 1991 to 1997
STU-III secure telephones on display at the National Cryptologic Museum
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National Cryptologic Memorial

The National Security Agency (NSA) is a national-level intelligence agency of the United States Department of Defense, under the authority of the Director of National Intelligence (DNI).

National Reconnaissance Office

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Close-up of Atlas 501 payload fairing with NROL-41 satellite (poster commemorating 50 years of NRO).
Serum and Vaccine Institute in Al-A'amiriya, Iraq, as imaged by a US reconnaissance satellite in November 2002.
US Satellite imagery of Syrian tanks departing Da'el in Daraa province after several days of assaults against the town in April 2012.
NRO Organizational Chart (Sep. 2010)
NRO budget FY 2004 to 2013
KH-9 Hexagon during integration at Lockheed
NRO ground station at Buckley Space Force Base, Aurora, CO
NRO Organization, circa 1971
NRO Organization, circa 2009
Patch commemorating launch of a classified payload
The official mission patch from Launch-39
National Reconnaissance Operations Center
ADF-East Logo
ADF-Southwest Logo
ADF-Colorado Logo

The National Reconnaissance Office (NRO) is a member of the United States Intelligence Community and an agency of the United States Department of Defense which designs, builds, launches, and operates the reconnaissance satellites of the U.S. federal government, and provides satellite intelligence to several government agencies, particularly signals intelligence (SIGINT) to the NSA, imagery intelligence (IMINT) to the NGA, and measurement and signature intelligence (MASINT) to the DIA.

Unified combatant commands areas of responsibility

Unified combatant command

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Unified combatant commands areas of responsibility
Geographic areas of responsibility for six land-based geographic combatant commands
Commanders of unified and specified combatant command during an annual meeting with Chairman of the Joint Chiefs of Staff and members of the Joint Chiefs of Staff at The Pentagon, Joint Chiefs of Staff Room also known as "The Tank" on January 15, 1981.
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A unified combatant command (CCMD), also referred to as a combatant command, is a joint military command of the United States Department of Defense that is composed of units from two or more service branches of the United States Armed Forces, and conducts broad and continuing missions.

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

United States Air Force

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Air service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States.

Air service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States.

The first F-35 Lightning II of the 33rd Fighter Wing arriving at Eglin AFB
An Air Force RQ-4 strategic reconnaissance aircraft
An Air Force KC-46 Pegasus refuels a C-17A Globemaster III
An Air Force A-10 demonstrating close air support at Nellis AFB
Test launch of a LGM-30 Minuteman Intercontinental Ballistic Missile from Vandenberg AFB
Combined Air Operations Center at Al Udeid Air Base
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–
The SR-71 Blackbird was a Cold War reconnaissance plane.
The F-117 Nighthawk was a stealth attack aircraft (retired from service in April 2008).
A row of Douglas C-54 Skymasters during the Berlin Airlift in 1949
Various Air Force personnel pose during the Air Force's 74th birthday celebration at the Pentagon, September 17, 2021.
Organization of the United States Air Force within the Department of Defense
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Pararescuemen and a simulated "survivor" watch as an HH-60G Pave Hawk helicopter comes in for a landing
U.S. Air Force trainee demonstrating a butt stroke on a strike dummy as part of Basic Military Training.
USAF Airmen training at Lackland AFB
A-10 Thunderbolt II ground-attack aircraft
B-2 Spirit stealth bomber
A C-17 Globemaster III, the USAF's newest and most versatile transport plane
E-3 Sentry airborne warning and control system
F-22 Raptor stealth air superiority fighter
KC-10 Extender tri-jet air-to-air tanker
An MC-12W Liberty at Beale AFB
MQ-9 unmanned aerial vehicle
Lockheed U-2 spy plane
RQ-170 Sentinel stealth unmanned aerial vehicle reconnaissance aircraft
VC-25A (Air Force One)
A WC-130J Hercules from the 53rd Weather Reconnaissance Squadron
An unarmed Minuteman III ICBM shoots out of the silo during an operational test launch

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.