U.S. Defense Department

The U.S. Department of Defense (DoD) is the federal agency responsible for national security and defense. It oversees all branches of the military—Army, Navy, Air Force, Marine Corps, and Space Force—to protect the country from threats and ensure its safety. The DoD develops military strategies, manages defense resources, and works with allies. It also handles military operations, research, and technological advancements. Essentially, it serves as the government’s primary organization for defending the nation and maintaining national security through military force and related activities.