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The web page explains the complex organizational structure of the United States Department of Defense (DoD) and the chain of command from the President to the Secretary of Defense and the Unified Combatant Commanders. The non-operational chain of command runs from the President to the Secretary of Defense and then to the Secretary of the Army, Navy, Air Force, or Space Force.
Learn about the history, components, and organization of the U.S. Army, a large military unit with three branches: active, reserve, and National Guard. The web page covers the Department of the Army, the Army Commands, and the Army Service Component Commands.
Learn about the history, structure, and role of the U.S. military forces, which consist of six service branches: Army, Marine Corps, Navy, Air Force, Space Force, and Coast Guard. The U.S. Armed Forces are among the world's largest and most powerful, with a global presence and influence.
Find out the Military Occupational Specialty (MOS) codes and descriptions for enlisted soldiers, officer areas of concentration (AOC) for commissioned officers, and warrant officer military occupational specialty (WOMOS) for warrant officers in the US Army. See the changes and updates in the personnel management systems since 2004.
Learn about the structure and functions of the U.S. Department of Defense, which oversees the military services, the Joint Chiefs of Staff, and various agencies and offices. See the organization chart of the Office of the Secretary of Defense and the Department of the Army as examples.
Learn about the four main bodies of the U.S. Navy: the Office of the Secretary of the Navy, the Office of the Chief of Naval Operations, the operating forces, and the Shore Establishment. Find out the roles, functions, and components of each body, as well as the history and status of the numbered fleets.
This web page explains the structure and functions of military forces, branches, commands, formations, and units. It does not provide any information on the size of a battalion or how to measure it in different countries or services.
Learn about the eight federal uniformed services that commission officers and have military or law enforcement duties in the U.S. The web page covers the history, structure, and roles of each service, as well as their relations with the executive departments and civilian leaders.