United States Department of Defense

Department of DefenseU.S. Department of DefenseUS Department of DefenseDoDDefense DepartmentDefensePentagonU.S. Defense DepartmentUS DoDthe Pentagon
The United States Department of Defense (DoD, USDOD or DOD) is an 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.wikipedia
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The Pentagon

PentagonPentagon buildingUS Pentagon
Headquartered at the Pentagon in Arlington, Virginia, just outside Washington, D.C., the DoD's stated mission is to provide "the military forces needed to deter war and ensure our nation's security".
The Pentagon is the headquarters building of the United States Department of Defense.

United States Secretary of Defense

Secretary of DefenseU.S. Secretary of DefenseDefense Secretary
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.
The secretary of defense (SecDef) is the leader and chief executive officer of the United States Department of Defense, the executive department of the Armed Forces of the U.S. The secretary of defense's position of command and authority over the U.S. military is second only to that of the president.

United States Armed Forces

United States militaryU.S. militaryUS military
The United States Department of Defense (DoD, USDOD or DOD) is an 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.
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.

United States Department of the Army

Department of the ArmyU.S. Department of the ArmyArmy
Beneath the Department of Defense are three subordinate military departments: the Department of the Army, the Department of the Navy, and the Department of the Air Force. The Department of Defense is composed of the Office of the Secretary of Defense (OSD), the Joint Chiefs of Staff (JCS) and the Joint Staff (JS), Office of the Inspector General (DODIG), the Combatant Commands, the Military Departments (Department of the Army (DA), Department of the Navy (DON) & Department of the Air Force (DAF)), the Defense Agencies and Department of Defense Field Activities, the National Guard Bureau (NGB), and such other offices, agencies, activities, organizations, and commands established or designated by law, or by the president or by the Secretary of Defense.
The Department of the Army (DA) is one of the three military departments within the Department of Defense of the United States of America.

United States Department of the Air Force

Department of the Air ForceHeadquarters, United States Air ForceAir Force
Beneath the Department of Defense are three subordinate military departments: the Department of the Army, the Department of the Navy, and the Department of the Air Force. The Department of Defense is composed of the Office of the Secretary of Defense (OSD), the Joint Chiefs of Staff (JCS) and the Joint Staff (JS), Office of the Inspector General (DODIG), the Combatant Commands, the Military Departments (Department of the Army (DA), Department of the Navy (DON) & Department of the Air Force (DAF)), the Defense Agencies and Department of Defense Field Activities, the National Guard Bureau (NGB), and such other offices, agencies, activities, organizations, and commands established or designated by law, or by the president or by the Secretary of Defense.
The Department of the Air Force (DAF) is one of the three Military Departments within the Department of Defense of the United States of America.

National Security Agency

NSAArmed Forces Security AgencyNational Computer Security Center
In addition, four national intelligence services are subordinate to the Department of Defense: the Defense Intelligence Agency (DIA), the National Security Agency (NSA), the National Geospatial-Intelligence Agency (NGA), and the National Reconnaissance Office (NRO).
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.

Defense Intelligence Agency (United States)

Defense Intelligence AgencyDIAU.S. Defense Intelligence Agency
In addition, four national intelligence services are subordinate to the Department of Defense: the Defense Intelligence Agency (DIA), the National Security Agency (NSA), the National Geospatial-Intelligence Agency (NGA), and the National Reconnaissance Office (NRO).
A component of the Department of Defense (DoD) and the United States Intelligence Community (IC), DIA informs national civilian and defense policymakers about the military intentions and capabilities of foreign governments and non-state actors.

National Geospatial-Intelligence Agency

NGADefense Mapping AgencyNational Imagery and Mapping Agency
In addition, four national intelligence services are subordinate to the Department of Defense: the Defense Intelligence Agency (DIA), the National Security Agency (NSA), the National Geospatial-Intelligence Agency (NGA), and the National Reconnaissance Office (NRO).
The National Geospatial-Intelligence Agency (NGA) is a combat support agency under the United States Department of Defense and a member of the United States Intelligence Community, with the primary mission of collecting, analyzing, and distributing geospatial intelligence (GEOINT) in support of national security.

National Reconnaissance Office

NROUS NROUnited States National Reconnaissance Office
In addition, four national intelligence services are subordinate to the Department of Defense: the Defense Intelligence Agency (DIA), the National Security Agency (NSA), the National Geospatial-Intelligence Agency (NGA), and the National Reconnaissance Office (NRO).
The National Reconnaissance Office (NRO) is a member of the United States Intelligence Community and an agency of the United States Department of Defense.

List of U.S. Department of Defense agencies

Defense agenciesDefense Agencies and DoD Field Activities
Other Defense agencies include the Defense Advanced Research Projects Agency (DARPA), the Strategic Capabilities Office (SCO), the Defense Logistics Agency (DLA), the Missile Defense Agency (MDA), the Defense Health Agency (DHA), Defense Threat Reduction Agency (DTRA), the Defense Counterintelligence and Security Agency (formerly the DSS), and the Pentagon Force Protection Agency (PFPA), all of which are subordinate to the Secretary of Defense. The Department of Defense is composed of the Office of the Secretary of Defense (OSD), the Joint Chiefs of Staff (JCS) and the Joint Staff (JS), Office of the Inspector General (DODIG), the Combatant Commands, the Military Departments (Department of the Army (DA), Department of the Navy (DON) & Department of the Air Force (DAF)), the Defense Agencies and Department of Defense Field Activities, the National Guard Bureau (NGB), and such other offices, agencies, activities, organizations, and commands established or designated by law, or by the president or by the Secretary of Defense.
This is a list of Agencies under the United States Department of Defense (DoD) which was formerly and shortly known as the National Military Establishment.

Defense Logistics Agency

Defense Supply AgencyDLADefense Reutilization Management Operations
Other Defense agencies include the Defense Advanced Research Projects Agency (DARPA), the Strategic Capabilities Office (SCO), the Defense Logistics Agency (DLA), the Missile Defense Agency (MDA), the Defense Health Agency (DHA), Defense Threat Reduction Agency (DTRA), the Defense Counterintelligence and Security Agency (formerly the DSS), and the Pentagon Force Protection Agency (PFPA), all of which are subordinate to the Secretary of Defense.
The Defense Logistics Agency (DLA) is a combat support agency in the United States Department of Defense, with more than 26,000 civilian and military personnel throughout the world.

United States Department of the Navy

Department of the NavyNavy DepartmentUnited States Naval Service
Beneath the Department of Defense are three subordinate military departments: the Department of the Army, the Department of the Navy, and the Department of the Air Force. The Department of Defense is composed of the Office of the Secretary of Defense (OSD), the Joint Chiefs of Staff (JCS) and the Joint Staff (JS), Office of the Inspector General (DODIG), the Combatant Commands, the Military Departments (Department of the Army (DA), Department of the Navy (DON) & Department of the Air Force (DAF)), the Defense Agencies and Department of Defense Field Activities, the National Guard Bureau (NGB), and such other offices, agencies, activities, organizations, and commands established or designated by law, or by the president or by the Secretary of Defense.
The Department of the Navy was an Executive Department and the Secretary of the Navy was a member of the President's cabinet until 1949, when amendments to the National Security Act of 1947 changed the name of the National Military Establishment to the Department of Defense and made it an Executive Department.

Pentagon Force Protection Agency

PFPA
Other Defense agencies include the Defense Advanced Research Projects Agency (DARPA), the Strategic Capabilities Office (SCO), the Defense Logistics Agency (DLA), the Missile Defense Agency (MDA), the Defense Health Agency (DHA), Defense Threat Reduction Agency (DTRA), the Defense Counterintelligence and Security Agency (formerly the DSS), and the Pentagon Force Protection Agency (PFPA), all of which are subordinate to the Secretary of Defense.
The Pentagon Force Protection Agency (PFPA) is an American law enforcement agency within the U.S. Department of Defense (DoD) charged with protecting and safeguarding the occupants, visitors, and infrastructure of The Pentagon, the Mark Center Building, the Defense Health Headquarters, and other assigned Pentagon facilities.

President of the United States

PresidentU.S. PresidentUnited States President
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.
The present-day operational command of the Armed Forces is delegated to the Department of Defense and is normally exercised through the secretary of defense.

United States Intelligence Community

Intelligence CommunityU.S. Intelligence CommunityU.S. intelligence
In addition, four national intelligence services are subordinate to the Department of Defense: the Defense Intelligence Agency (DIA), the National Security Agency (NSA), the National Geospatial-Intelligence Agency (NGA), and the National Reconnaissance Office (NRO).

Defense Counterintelligence and Security Agency

Defense Security ServiceDefense Investigative Serviceformerly the DSS
Other Defense agencies include the Defense Advanced Research Projects Agency (DARPA), the Strategic Capabilities Office (SCO), the Defense Logistics Agency (DLA), the Missile Defense Agency (MDA), the Defense Health Agency (DHA), Defense Threat Reduction Agency (DTRA), the Defense Counterintelligence and Security Agency (formerly the DSS), and the Pentagon Force Protection Agency (PFPA), all of which are subordinate to the Secretary of Defense.
The Defense Counterintelligence and Security Agency (DCSA) is a federal security agency of the United States Department of Defense (DoD).

United States federal executive departments

federal executive departmentsexecutive departmentsfederal executive department
The United States Department of Defense (DoD, USDOD or DOD) is an 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.

Dwight D. Eisenhower School for National Security and Resource Strategy

Industrial College of the Armed ForcesArmy Industrial CollegeArmed Forces Industrial College
The Department of Defense also operates several joint services schools, including the Eisenhower School (ES) and the National War College (NWC).
The Eisenhower School is a United States military educational institution tasked with preparing selected military officers and civilians for senior national security leadership positions dealing with the resource component of national power.

United States Department of War

War DepartmentUnited States War DepartmentDepartment of War
Finally, on the last day of the session, September 29, 1789, Congress created the War Department, historic forerunner of the Department of Defense.
The War Department existed from August 7, 1789 until September 18, 1947, when it split into the Department of the Army and the Department of the Air Force and joined the Department of the Navy as part of the new joint National Military Establishment (NME), renamed the United States Department of Defense in 1949.

United States Air Force

U.S. Air ForceAir ForceUSAF
On July 26, 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.
The U.S. 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.

Central Intelligence Agency

CIAC.I.A.Central Intelligence Agency (CIA)
On July 26, 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.
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.

Defense Health Agency

DHA
Other Defense agencies include the Defense Advanced Research Projects Agency (DARPA), the Strategic Capabilities Office (SCO), the Defense Logistics Agency (DLA), the Missile Defense Agency (MDA), the Defense Health Agency (DHA), Defense Threat Reduction Agency (DTRA), the Defense Counterintelligence and Security Agency (formerly the DSS), and the Pentagon Force Protection Agency (PFPA), all of which are subordinate to the Secretary of Defense.
The United States Department of Defense established the DHA as part of a larger effort meant to reorganize its health care programs and services.

DARPA

Defense Advanced Research Projects AgencyAdvanced Research Projects AgencyARPA
Other Defense agencies include the Defense Advanced Research Projects Agency (DARPA), the Strategic Capabilities Office (SCO), the Defense Logistics Agency (DLA), the Missile Defense Agency (MDA), the Defense Health Agency (DHA), Defense Threat Reduction Agency (DTRA), the Defense Counterintelligence and Security Agency (formerly the DSS), and the Pentagon Force Protection Agency (PFPA), all of which are subordinate to the Secretary of Defense.
The Defense Advanced Research Projects Agency (DARPA) is an agency of the United States Department of Defense responsible for the development of emerging technologies for use by the military.

Defense Contract Management Agency

DCMAcontractingDefense Contract Management Command
Additionally, the Defense Contract Management Agency (DCMA) delivers actionable acquisition intelligence, from factory floor to the warfighter.
It is responsible for administering contracts for the Department of Defense (DoD) and other authorized federal agencies.

Office of the Secretary of Defense

OSDOffice of the Secretary of Defense (OSD)Deputy Assistant Secretary of Defense
The Department of Defense is composed of the Office of the Secretary of Defense (OSD), the Joint Chiefs of Staff (JCS) and the Joint Staff (JS), Office of the Inspector General (DODIG), the Combatant Commands, the Military Departments (Department of the Army (DA), Department of the Navy (DON) & Department of the Air Force (DAF)), the Defense Agencies and Department of Defense Field Activities, the National Guard Bureau (NGB), and such other offices, agencies, activities, organizations, and commands established or designated by law, or by the president or by the Secretary of Defense.
The Office of the Secretary of Defense (OSD) is a headquarters-level staff of the United States Department of Defense.