United States Department of Defense
Agency overview
Preceding agency	Department of War
Jurisdiction	Federal government of the  United States
Headquarters	The Pentagon, Arlington Co., Virginia 38°52′15.56″N 77°3′21.46″W / 38.8709889°N 77.0559611°W / 38.8709889; -77.0559611
Employees	700,000 civilian 1,418,542 military 1,100,000 reserve (2009)
Annual budget	US$637 billion (2009) US$664 billion (est. 2010) US$525 billion (est. 2011)
Agency executives	Leon Panetta, Secretary William J. Lynn III, Deputy Secretary
Website
defense.gov

The United States Department of Defense (USDOD, DOD or DoD, initially the National Military Establishment (NME)) is the U.S. federal department allocated the largest level of budgetary resources and charged with coordinating and supervising all agencies and functions of the government relating directly to national security and the United States armed forces. The organization and functions of the DoD are set forth in Title 10 of the United States Code.

The DoD is the major tenant of The Pentagon building near Washington, D.C., and has three main components—the Departments of the Army, Navy, and Air Force. Among the many DoD agencies are the Missile Defense Agency, the Defense Advanced Research Projects Agency (DARPA), the Pentagon Force Protection Agency (PFPA), the Defense Intelligence Agency (DIA), the National Geospatial-Intelligence Agency (NGA), and the National Security Agency (NSA). The department also operates several joint service schools, including the National War College.

History

In 1945, specific plans for the proposed DoD were put forth by the Army, the Navy, and the Joint Chiefs of Staff. In a special message to Congress on 19 December 1945, President Harry Truman proposed creation of a unified department of state defense. A proposal went to Congress in April 1946, but was held up by the Naval Affairs Committee^{[disambiguation needed]} hearings in July 1946, which raised objections to the concentration of power in a single department. Truman eventually sent new legislation to Congress in February 1947, where it was debated and amended for several months.

DoD was created in 1947 as the National Military Establishment with a single secretary as its head to preside over the former Department of War (founded in 1789) and Department of the Navy (founded in 1798; formerly the Board of Admiralty, founded in 1780). The Department of the Air Force was also created as a new service (previously under the War Department as the Army Air Forces). DoD was created in order to reduce interservice rivalry, which was believed to have reduced military effectiveness during World War II.

On July 26, 1947, Truman signed the National Security Act of 1947, which set up the "National Military Establishment" to begin operations on September 18, the day after the Senate confirmed James V. Forrestal as the first Secretary of Defense. The Establishment had the unfortunate abbreviation "NME" (with a pronunciation virtually identical to "enemy"), and was renamed the "Department of Defense" (also described in the Act under "Title II - The Department of Defense", and later abbreviated as "DoD") on August 10, 1949; though the new title was not without its own criticism.

In addition, the Secretary of Defense was given greater authority over three of the branches of the military (Army, Navy, and Air Force). Prior to the creation of the National Military Establishment/Department of Defense, the Armed Forces of the U.S. were separated into different cabinet-level departments without much central authority. The Marine Corps remained as a separate service under the Department of the Navy, and the Coast Guard was under Department of Transportation, ready to be shifted to the Navy Department during time of declared war (as it was in both world wars).

Organization

The Pentagon headquarters the United States Department of Defense.

The Department includes the Army, Navy, Air Force, Marine Corps, as well as non-combat agencies such as the National Security Agency and the Defense Intelligence Agency, including the NORAD base in Colorado Springs. The DoD's annual budget was roughly US$786 billion in 2007. This figure does not include tens of billions more in supplemental expenditures allotted by Congress throughout the year, particularly for the war in Iraq, or expenditures by the Department of Energy on nuclear weapons design and testing.

Civilian control over matters other than operations is exercised through the three service departments, the Department of the Army, the Department of the Navy (which includes the Marine Corps), and the Department of the Air Force. Each is led by a service secretary, who are below Cabinet rank.

In wartime the Department of Defense has authority over the Coast Guard, which is under the control of the Department of Homeland Security (DHS) in peacetime. Prior to the creation of DHS, the Coast Guard was under the control of the Department of Transportation, and earlier under the Department of the Treasury. According to the U.S. Code, the Coast Guard is at all times considered one of the five armed services of the United States. During times of declared war (or by Congressional direction), the Coast Guard operates as a part of the Navy; this has not happened since World War II, but members have served in undeclared wars and conflicts since then while the service remained in its peacetime department.

The Pentagon, in Arlington County, Virginia, across the Potomac River from Washington, D.C., is the headquarters of the Department of Defense. The Department of Defense is protected by the Pentagon Force Protection Agency which ensures law enforcement and security for the Pentagon and various other jurisdictions throughout the National Capital Region (NCR).

Command structure

The President of the United States is the Commander-in-Chief of the U.S. military.

The command structure of the Department of Defense is defined by the Goldwater-Nichols Act of 1986 (PL 99-433), signed into law by President Ronald Reagan on 1 October 1986. The Act reworked the command structure of the United States military, introducing the most sweeping changes to the Department since it was established in the National Security Act of 1947. Under the act, the chain of command runs from the President of the United States, through the Secretary of Defense, to the combatant commanders (COCOM) who command all military forces within their area of responsibility. The Chairman of the Joint Chiefs of Staff and the service Chiefs of Staff are responsible for readiness of the U.S. military and serve as the President's military advisers, but are not in the chain of command. The Chairman of the Joint Chiefs of Staff is by law the highest-ranking military officer in the United States. Each service is responsible for organizing, training and equipping military units for the commanders of the various Unified Combatant Commands.

National Command organizational chart

Components

2008 Office of the Secretary of Defense Structure.

Defense Agencies within the Department of Defense.

Secretary of Defense

• Deputy Secretary of Defense

Office of the Secretary of Defense

• • • Joint Improvised Explosive Device Defeat Organization
    • Defense Policy Board Advisory Committee
• General Counsel of the Department of Defense
  • Defense Legal Services Agency
• Under Secretary of Defense for Intelligence
  • Defense Intelligence Agency
  • Defense Security Service
  • National Geospatial-Intelligence Agency
  • National Reconnaissance Office
  • National Security Agency
• Under Secretary of Defense for Policy
  • Defense Security Cooperation Agency
  • Defense Prisoner of War/Missing Personnel Office
• Under Secretary of Defense for Acquisition, Technology and Logistics
  • Defense Technical Information Center
  • Defense Advanced Research Projects Agency
  • Missile Defense Agency
  • Defense Contract Management Agency
  • Defense Logistics Agency
  • Defense Threat Reduction Agency
  • Office of Economic Adjustment
  • Defense Acquisition University
  • Business Transformation Agency
  • Operational Test and Evaluation Directorate (DOT&E)
• Under Secretary of Defense for Personnel and Readiness
  • Defense Commissary Agency
  • Defense Human Resources Activity
  • Department of Defense Education Activity
    • Department of Defense Dependents Schools
  • Uniformed Services University of the Health Sciences
  • Defense Equal Opportunity Management Institute
  • Office of the Chancellor for Education and Professional Development
• Under Secretary of Defense Comptroller
  • Defense Contract Audit Agency
  • Defense Finance and Accounting Service
• Director, Program Analysis and Evaluation
  • Office of Net Assessment
• Assistant Secretary of Defense for Networks and Information Integration
  • Defense Information Systems Agency
• Assistant Secretary of Defense for Public Affairs
  • Deputy Assistant Secretary of Defense, Internal Communications
• Director of Administration and Management
  • Pentagon Force Protection Agency
  • Washington Headquarters Services
• Assistant Secretary of Defense for Health Affairs
  • Military Health System
    • TRICARE Management Activity[2]

Military Departments

• Department of the Army (including the U.S. Army)
• Secretary of the Army
  • Headquarters, Department of the Army (HQDA)
    • Office of the Secretary of the Army
      • Under Secretary of the Army
        • Assistant Secretary of the Army (Acquisition, Logistics, and Technology)
        • Assistant Secretary of the Army (Civil Works)
        • Assistant Secretary of the Army (Financial Management and Comptroller)
        • Assistant Secretary of the Army (Installations, Energy and Environment)
        • Assistant Secretary of the Army (Manpower and Reserve Affairs)
        • General Counsel of the Army
    • The Army Staff
      • Chief of Staff of the Army
        • Vice Chief of Staff of the Army
        • Sergeant Major of the Army
  • Army Field Organizations (See Structure of the United States Army)
    • Army Commands
    • Army Component Commands
    • Field Operating Agencies
    • Direct Reporting Units
    • United States Army Corps of Engineers
• Department of the Navy (including the U.S. Navy and U.S. Marine Corps)
• Secretary of the Navy
  • Navy Department
    • Office of the Secretary of the Navy
      • Under Secretary of the Navy
        • Assistant Secretary of the Navy (Financial Management and Comptroller)
        • Assistant Secretary of the Navy (Installations and Environment)
        • Assistant Secretary of the Navy (Manpower and Reserve Affairs)
        • Assistant Secretary of the Navy (Research, Development and Acquisitions)
        • General Counsel of the Navy
    • Office of the Chief of Naval Operations
      • Chief of Naval Operations
        • Vice Chief of Naval Operations
        • Master Chief Petty Officer of the Navy
    • Headquarters Marine Corps
      • Commandant of the Marine Corps
        • Assistant Commandant of the Marine Corps
        • Sergeant Major of the Marine Corps
  • Marine Corps Field Organizations (See Organization of the United States Marine Corps)
    • Operating Forces
    • Support Establishment
    • Marine Forces Reserve
  • Navy Field Organizations (See Structure of the United States Navy)
    • Operating Forces
    • Shore Establishment
• Department of the Air Force (including the U.S. Air Force)
• Secretary of the Air Force
  • Headquarters Air Force (HAF)
    • Office of the Secretary of the Air Force
      • Under Secretary of the Air Force
        • Assistant Secretary of the Air Force (Acquisition)
        • Assistant Secretary of the Air Force (Financial Management & Comptroller)
        • Assistant Secretary of the Air Force (Installations, Environment & Logistics)
        • Assistant Secretary of the Air Force (Manpower & Reserve Affairs)
        • General Counsel of the Air Force
    • The Air Staff
      • Chief of Staff of the Air Force
        • Vice Chief of Staff of the Air Force
        • Chief Master Sergeant of the Air Force
  • Air Force Field Organizations
    • Major Commands
    • Direct Reporting Units
    • Field Operating Agencies

Joint Chiefs of Staff

• Chairman of the Joint Chiefs of Staff (CJCS)
  • Vice Chairman of the Joint Chiefs of Staff (VCJCS)
    • Joint Requirements Oversight Council (JROC)
  • The Joint Staff (Director of the Joint Staff)
  • National Defense University (NDU)

Office of the Inspector General

• Inspector General of the Department of Defense
  • Defense Criminal Investigative Service

National Guard Bureau

• Director of the National Guard Bureau

Other

The United States Naval Observatory falls under the Chief of Naval Operations. In 2003 the National Communications System was moved to the Department of Homeland Security, but only for executive purposes; it still centralizes its activities within the Department of Defense, since the human resources required by NCS (example: Military Departments) still reside within the Department of Defense, or for retention of practical maintenance.

Unified Combatant Commands

There are nine Unified Combatant Commands; six regional and three functional. United States Africa Command became initially operational in October 2007, while Joint Forces Command was officially disestablished on August 4, 2011.

The Geographic Commands

In 2007, a new geographical command for Africa was authorized. This proposed significant changes to the areas of responsibility for other adjacent geographical commands as shown in the accompanying graphic.

Expenditures

Military spending as a percentage of GDP.

In the United States Federal Budget for 2010, entitled 'A New Era of Responsibility', the DoD was allocated a base budget of $533.7 billion, with a further $75.5 billion adjustment in respect of 2009, and $130 billion for overseas contingencies. The subsequent 2010 DoD Financial Report shows DoD total budgetary resources for fiscal year 2010 were $1.2 trillion. Of these resources, $1.1 trillion were obligated and $994 billion were disbursed, with the remaining resources relating to multi-year modernization projects requiring additional time to procure.

Budgeted DoD expenditure for 2009 represented approximately 43% of global military spending, the U.S. ranking second in terms of per capita military spending behind The United Arab Emirates. In FY 2010 DoD budgeted spending accounted for 21% of the U.S. Federal Budget, and 53% of federal discretionary spending, which represents funds not accounted for by pre-existing obligations.

As a percentage of its GDP, the U.S. spent 3% of GDP on military in the year 2000, ranking it 28th in the world. Budgeted 2010 expenditure (including the GWOT supplemental) had risen to 4.5 % of Assumed Nominal GDP.

GAO audits

The US Government Accountability Office was unable to provide an audit opinion on the 2010 financial statements of the US Government because of "widespread material internal control weaknesses, significant uncertainties, and other limitations". The GAO cited as the principal obstacle to its provision of an audit opinion "serious financial management problems at the Department of Defense that made its financial statements unauditable".

In Fiscal Year (FY) 2010 six out of thirty-three DoD reporting entities received unqualified audit opinions.

Under Secretary of Defense Robert F. Hale acknowledged enterprise-wide problems with systems and processes, while the DoD's Inspector General reported "material internal control weaknesses ... that affect the safeguarding of assets, proper use of funds, and impair the prevention and identification of fraud, waste, and abuse". Further management discussion in the FY 2010 DoD Financial Report states "it is not feasible to deploy a vast number of accountants to manually reconcile our books" and concludes that "although the financial statements are not auditable for FY 2010, the Department's financial managers are meeting warfighter needs".

In addition to FY 2010, the Department of Defense's financial statements were either unauditable or such that no audit opinion could be expressed for FYs 2009-1998.

Reform

In a statement of 6 January 2011 Defense Secretary Robert M. Gates stated: "This department simply cannot risk continuing down the same path - where our investment priorities, bureaucratic habits and lax attitude towards costs are increasingly divorced from the real threats of today, the growing perils of tomorrow and the nation's grim financial outlook." Gates has proposed a budget which, if approved by the Congress, would reduce the costs of many DOD programs and policies, including reports, the IT infrastructure, fuel, weapon programs, DOD bureaucracies, and personnel.

Facilities and energy

DoD's Energy Conservation Investment Program (ECIP) improves the energy and water efficiency of existing Military Services' facilities. The program's projects help the Military Services save on energy usage and cost. The American Recovery and Reinvestment Act of 2009 provided $120 million for the ECIP.

The American Recovery and Reinvestment Act of 2009 has also given money for the Army, Navy, Marine Corps, Air Force, Army Reserve, Navy Reserve, Marine Corps Reserve, Air Force Reserve, Army National Guard and Air National Guard facilities to invest in energy efficiency.

Energy use

The Department of Defense uses 4,600,000,000 US gallons (1.7×10¹⁰ L) (4.6 billion gallons) of fuel annually, an average of 12,600,000 US gallons (48,000,000 L) (12.6 million gallons) of fuel per day. A large Army division may use about 6,000 US gallons (23,000 L) per day. According to the 2005 CIA World Factbook, the DoD would rank 34th in the world in average daily oil use, coming in just behind Iraq and just ahead of Sweden.

In FY 2006, the DoD used almost 30,000 gigawatt hours (GWH) of electricity, at a cost of almost $2.2 billion. The DoD's electricity use would supply enough electricity to power more than 2.6 million average American homes. In electricity consumption, the DoD would rank 58th in the world, using slightly less than Denmark and slightly more than Syria (CIA World Factbook, 2006).

The DoD uses 93% of all US government fuel consumption (Air Force: 52%; Navy: 33%; Army: 7%. Other DoD: 1%).

In 2010, DoD established the Office of the Assistant Secretary of Operational Energy Plans and Programs to coordinate energy issues. In July 2010, DoD also signed a Memorandum of Understanding with the U.S. Department of Energy to facilitate cooperation and accelerate research, development, and deployment of energy efficiency and renewable energy technologies.

The Air Force is the largest user of fuel energy in the federal government. The Air Force uses 10% of the nation's aviation fuel. (JP-8 accounts for nearly 90% of its fuels.) This fuel usage breaks down as such: 82% jet fuel, 16% facility management and 2% ground vehicle/equipment. To meet renewable energy goals, it plans to certify its entire fleet on coal-to-liquid synthetic fuel blends by 2011. By 2016, it plans to fuel half of its domestic transportation by US-produced synthetic blends, including blends of biofuels and jetfuels, known as Hydrotreated Renewable Jet (HRJ). The Air Force is currently the leading purchaser of renewable energy within the Federal government and has been a long time pioneer of renewable energy development and leadership. The Air Force is recognized by the Environmental Protection Agency as a Green Power Partner, one of the nation’s top purchasers of green power. The Air Force Energy Plan, published in May 2010, includes more information about the Air Force’s goals, including reducing demand, increasing supply, and changing the culture to include energy awareness.

The US Army has recently prioritized renewable energy strategies in Iraq. Strategies include the Tactical Garbage to Energy Refinery Program, which converts 1 short ton (0.91 t) of waste to 11 US gal (42 L) of JP-8 fuel, a photovoltaic flexible, portable mat, insulating foam technology, hybrid-electric Manned Ground Vehicles (MGV), and highly efficient portable cells. The American Recovery and Reinvestment Act gave more than $150 million to develop these technologies. Stateside, the Army created the Net Zero program with a goal to have 30 installations achieve net-zero energy by 2030, including some that will also be net-zero in waste and water. In 2011, they opened the Base Camp Systems Integration Laboratory, which compares an energy efficient base camp with a traditional one and trains soldiers to use energy efficient technologies. The Army Energy Security Implementation Strategy, published in 2009, gives details about the Army’s energy goals.

The Department of the Navy established Task Force Energy to focus on meeting energy goals, which include reducing non-tactical petroleum use in the commercial fleet by 50 percent by 2015, producing at least 50 percent of shore based energy from alternative sources by 2050, acquiring 50 percent of total energy from alternative sources by 2020, and having 50 percent of Navy and Marine Corps installations be net-zero by 2020. The Navy hopes to demonstrate a Green Strike Group (fueled by biofuels and nuclear power) by 2012 and sail the Great Green Fleet by 2016. The Office of Naval Research developed and deployed the Experimental Forward Operating Base (ExFOB), including photovoltaic energy, shelter insulation, small unit water purification, and energy efficient heating, lighting, and cooling.

The Marine Corps established the Expeditionary Energy Office to increase combat effectiveness by reducing the need for liquid fossil fuel by 50 percent by 2025, using liquid fuel for mobility only.

Civilian control

Article II Section 2 of the Constitution designates the President as "Commander in Chief" of the Army, Navy and state militias. The President exercises this supreme command authority through the civilian Secretary of Defense who by federal law is the head of the department, has authority direction, and control over the Department of Defense, and is the principal assistant to the President in all matters relating to the Department of Defense. The Secretary's principal deputy is the equally civilian Deputy Secretary of Defense who is delegated full powers to act for the Secretary of Defense. The Office of the Secretary of Defense (OSD) is the Secretary and Deputy Secretary's civilian staff, which includes several Under Secretaries and Assistant Secretaries of Defense with functional oversight responsibilities. The Secretaries of the Military Departments (i.e. Secretary of the Army, Secretary of the Navy, and the Secretary of the Air Force) are subordinate to the Secretary of Defense and has the authority under Title 10 of the United States Code to conduct all the affairs of their respective departments (Department of the Army, Department of the Navy, & Department of the Air Force) of which the military services are organized within.

Historically, there have been challenges to civilian control. Most notably, during the Korean War, General Douglas MacArthur ignored civilian instructions regarding advancing troops toward the Yalu River, which triggered an introduction of massive forces from China. Also, on April 5, 1950, Representative Joseph William Martin, Jr., the Minority leader of the United States House of Representatives, released copies of a letter from MacArthur critical of President Harry Truman's limited-war strategy to the press and read it aloud on the floor of the house. President Truman relieved MacArthur of command, and MacArthur then explored political options against Truman. The Revolt of the Admirals is another example in the same era of a challenge to civilian control.

DoD policies and directives protect the policy of civilian control by establishing strict limitations on the political activities of members of the military. For example, DoD Directive 1344.10 prohibits active duty military running for office or making political appearances in uniform. However, enforcing this strict separation between the military and politics has been problematic. For example, over the years, many elected officials, including members of Congress continued serving in the reserves while holding elected office. As another example, at a September 14, 2007, rally for Republican Presidential candidate John McCain in New Hampshire, seven on-duty uniformed Army personnel addressed the gathering. As another example, although DOD Directive 1344.10 prohibits political appearances by active duty military in uniform, Virginia Governor Bob McDonnell invited a uniformed Army Staff Sergeant to stand behind him during his televised Republican response to the 2010 State of the Union Address.

Current issues

Gulf War Illness - During 2001 and 2002, Dr. Robert F. Garry of Tulane University in New Orleans, successfully developed the Anti-Squalene Antibody blood test (ASA Assay) which can detect Gulf War Illness (US patent 6,214,566). However, soon thereafter, the rights to the patent were "Optioned" by the US Department of Defense and as of April 2011, the DOD is still sitting on the test, although still making payments to hold onto the rights. Tulane University, Dr. Garry and Autoimmune Technologies (A third-party company which apparently holds some legal right to the test) have remained silent. Source here: http://www.autoimmune.com/GWSGen.html and 2) Source here: http://tulane.edu/news/releases/archive/2000/antibodies_found_in_sick_soldiers.cfm

On February 26, 2002, the Office of the Inspector General, U.S. Department of Defense has reported that DoD has not and will not account for $1.1 trillion of "unsupported accounting entries". In addition, there have been several high-profile Government Accountability Office (GAO) investigations of the Department of Defense.

The GAO is also interested in ways DoD can partner with other government agencies to save money and create efficiencies. One way was through use of the Veterans Administration's Consolidated Mail Outpatient Pharmacy (CMOP) program. The CMOP fills continuation of therapy or refill prescriptions only. Initial prescriptions are written for veterans at one of the Veteran Administration’s health care facilities. When a refill is needed, the health care facilities process the prescriptions. The CMOP then uploads this information from multiple facilities in its region. Once filled, the United States Postal Service (USPS) delivers the prescriptions. The health care facility or clinic is notified of the prescription’s completion electronically. As of 2000, the annual workload was near 50 million prescriptions. Processing and filling prescriptions took two days; three more days were required for mail delivery.

The DoD and VA conducted a pilot program in FY 2003. In its 2005 report, GAO-05-555, the GAO found that the DOD could generate savings because CMOP's size allows it to negotiate volume discounts. The CMOP program is now serving the entire country from a number of locations including West Los Angeles, California; Bedford, Massachusetts; Dallas, Texas; Hines, Illinois, Charleston, South Carolina; Leavenworth, Kansas; and Murfreesboro, Tennessee.

In fall of 2006, the U.S. Defense Department accidentally shipped ballistic missile components instead of helicopter batteries to Taiwan, it was reported on March 25, 2008. The parts were 1960s technology, designed for use with Minuteman ballistic missiles. The missile components were first shipped from F.E. Warren Air Force Base in Wyoming to Hill Air Force Base in Utah in 2005.

On April 20, 2008, The New York Times published an exposé accusing the U.S. Department of Defense of running a propaganda "message machine" to spread the administration's talking points on Iraq by briefing retired military commanders for network television and cable television appearances, where they were presented as independent analysts.

The Guantanamo Bay detention camp is on a United States Department of Defense base and is run by the United States Department of Defense Joint Task Force Guantanamo, with the motto 'Honour Bound to Defend Freedom'. International calls for the closure of this facility due to acusations of torture perpetrated within have not been successful.

Military buildup

To meet the growing demands in the Middle East and around the world, Secretary of Defense Robert Gates proposed to President Bush to increase the overall size of the military by approximately 92,000 troops over the course of five years. Specifically, the proposal calls for an Army troop cap of 545,000 to 550,000 active duty soldiers and a troop cap of 202,000 active duty Marines. The total active duty force of the U.S. after the buildup will be about 1,479,000. There is also about 1.1 million reserve troops. There have also been calls to increase the sizes of the other branches of the military to match the increase in the Marines and Army.

Related legislation

• 1947: National Security Act of 1947
• 1958: Department of Defense Reorganization Act PL 85-899
• 1963: Department of Defense Appropriations Act PL 88-149
• 1963: Military Construction Authorization Act PL 88-174
• 1967: Supplemental Defense Appropriations Act PL 90-8
• 1984: Department of Defense Authorization Act PL 98-525
• 1986: Goldwater-Nichols Act of 1986 or Department of Defense Reorganization Act PL 99-433
• 1996: Antiterrorism and Effective Death Penalty Act PL 104-132

See also

	Government of the United States portal
	Military history portal

• The Berry Amendment, a U.S.C law that requires most goods used by the armed forces to be produced domestically.
• Defense contractor
• Defense industry
• DOD Information Assurance Certification and Accreditation Program
• Department of Defense Police
• Exceptional Family Member Program
• Identification badges of the United States military
• List of United States military bases
• Loss of Strength Gradient
• US Senate Report on chemical weapons

Agencies under the United States Department of Defense Headquarters: The Pentagon Secretary of Defense Deputy Secretary of Defense Office of the Secretary of Defense · Defense Policy Board Advisory Committee · Office of Net Assessment · Pentagon Force Protection Agency · Office of the Inspector General, U.S. Department of Defense Under Secretary of Defense for Acquisition, Technology and Logistics Director, Defense Research and Engineering · Defense Advanced Research Projects Agency · Missile Defense Agency · Defense Contract Management Agency · Defense Logistics Agency · Defense Technical Information Center · Defense Threat Reduction Agency · Office of Economic Adjustment · Defense Acquisition University · Business Transformation Agency Under Secretary of Defense for Policy Defense Security Cooperation Agency · Defense Prisoner of War/Missing Personnel Office Under Secretary of Defense (Comptroller) Defense Contract Audit Agency · Defense Finance and Accounting Service Under Secretary of Defense for Personnel and Readiness Defense Commissary Agency · Department of Defense Education Activity · DoD Human Resources Activity · Military Health System · Uniformed Services University of the Health Sciences · Defense Equal Opportunity Management Institute · Office of the Chancellor for Education and Professional Development Under Secretary of Defense for Intelligence Defense Intelligence Agency · Defense Security Service · Defense Information Systems Agency · National Geospatial-Intelligence Agency · National Reconnaissance Office · National Security Agency Service Departments Army: United States Army, Secretary Navy: United States Navy, United States Marine Corps, Secretary Air Force: United States Air Force, Secretary Joint Chiefs of Staff · Unified Combatant Command