| Title | Military Departments |
| Description | The Military Departments are the Departments of the Army, Navy, and Air Force (the Marine Corps is a part of the Department of the Navy). Each Military Department is separately organized under its own Secretary and functions under the authority, direction, and control of the Secretary of Defense. The Military Departments are responsible for organizing, training, and equipping forces for assignment to Unified Combatant Commands. |
| Parent Office | Secretary of Defense / Deputy Secretary of Defense |
| Child Offices | Department of the Army - Secretary of the Army
Department of the Air Force - Secretary of the Air Force
Department of the Navy - Secretary of the Navy
United States Marine Corps
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