Department of Defense (US)

The Department of Defense (DoD) is a federal agency responsible for overseeing the U.S. military, including the Army, Navy, Air Force, Marine Corps, and other defense agencies. Its primary mission is to ensure national security by protecting the country from external threats through military strength, strategic planning, and technological innovation. The DoD manages military operations, develops defense policies, and allocates resources for training, research, and readiness. It operates under civilian leadership, with the President as commander-in-chief, and plays a critical role in maintaining the safety and security of the United States.