The United States Department of State (DoS), often referred to as the State Department, is the United States federal executive department responsible for The United States Secretary of State is the head of the United States Department of State, concerned with foreign affairs. The Secretary is a member of the The United States Department of Justice (DOJ), also referred to as the Justice Department, is the United States federal executive department responsible for the The Department of Defense (also known as the Defense Department, USDOD, DOD, DoD or the Pentagon) is the Executive Department of the Government of