The Department of Defense is tasked with providing the military forces which the United States needs in order to protect the security of the nation and to deter war. The War Department, which eventually became the Department of Defense, was established in 1789, fourteen years after the Army, Marine Corps, and Navy were established.
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Recommended Resources
Major security agencies, concerned with safeguarding the United States features academia, business, research, public information and cryptologic history.
http://www.nsa.gov/
United States Department of Defense
The mission of the DOD is to provide the military forces needed to deter war and to protect the security of the United States of America and its interests. Site features news, photos, press resources and leaders.
http://www.defenselink.mil/