The Department of Defense

The Department of Defense (DoD) is a federal agency responsible for coordinating and overseeing the U.S. military services—Army, Navy, Air Force, Marine Corps, and Space Force. Its primary mission is to provide national security and protect the country from threats through defense planning, military operations, and strategic resources. The DoD manages military equipment, personnel, and infrastructure, ensuring readiness to defend U.S. interests both domestically and internationally. It operates under the guidance of civilian leadership and collaborates with other government agencies to maintain national safety and security.