The Department of Defense (DOD) is the U.S. federal department charged with coordinating and supervising all agencies and functions of the government relating directly to national security and the United States armed forces. It's headquarters are located in The Pentagon. The department is headed by a politically appointed Secretary of Defense.
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| United States Armed Forces | United States Air Force • United States Army • United States Marine Corps • United States National Guard • United States Navy |
| United States government agencies | Bureau of Alcohol, Tobacco and Firearms • Centers for Disease Control and Prevention • Central Intelligence Agency • Federal Bureau of Investigation • Food and Drug Administration • National Aeronautics and Space Administration • National Intelligence Department • National Security Agency • United States Army Corps of Engineers • United States Congress • United States Department of Defense • United States Department of Homeland Security • United States Department of State • United States House of Representatives • United States Merchant Marine • United States Secret Service • United States Senate • U.S. Securities and Exchange Commission |
| Terms | Constitution • President of the United States • Senator • US Representative |