U.S. Government Resources: Department of Defense

Department of Defense
http://www.defenselink.mil/

The mission of the Department of Defense is to provide the military forces needed to deter war and to protect the security of the United States. The department's headquarters is at the Pentagon. The mission of DefenseLINK is to support the overall mission of the Department of Defense by providing official, timely and accurate information about defense policies, organizations, functions and operations. Also, DefenseLINK is the single, unified starting point for finding military information on-line.

Organizational Chart     http://www.defenselink.mil/sites/o.html#organization