The U.S. Department of Defense is the federal executive department responsible for providing military forces to deter war and ensure the security of the United States. It oversees the Army, Navy, Marine Corps, Air Force, Space Force, and numerous defense agencies, and advises the President on military and national security matters.
National defense strategy, military readiness and operations, defense appropriations, cybersecurity, defense procurement and contracting, veterans transition support, counterterrorism, nuclear deterrence, space and emerging technologies policy, and international security cooperation
Annual appropriations from the U.S. Congress through the federal budget
U.S. Army, U.S. Navy, U.S. Marine Corps, U.S. Air Force, U.S. Space Force, National Guard Bureau, Defense Advanced Research Projects Agency, National Security Agency
Federal executive department
