Department of Defense

Mission: The mission the Department of Defense(DoD) (DoD Directive 5100.1) is responsible for providing the military forces needed to deter war and protect the security of the United States. The major elements of these forces are the Army, Navy, Air Force, and Marine Corps.

Functions:
- War-fighting
- Humanitarian Aid
- Peacekeeping
- Disaster Relief
- Homeland Security

As prescribed by higher authority, the Department of Defense shall maintain and employ
Armed Forces to:

• Support and defend the Constitution of the United States against all enemies, foreign and domestic.
  
• Ensure, by timely and effective military action, the security of the United States, its possessions, and areas vital to its interest.
  
• Uphold and advance the national policies and interests of the United States.