United States Department of Defense


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General Information
Description of AgencyThe Department of Defense is America's oldest and largest government agency. With our military tracing its roots back to pre-Revolutionary times, the Department of Defense has grown and evolved with our nation.

The Defense Department manages an inventory of installations and facilities to keep Americans safe. The Department’s physical plant is huge by any standard, consisting of more than several hundred thousand individual buildings and structures located at more than 5,000 different locations or sites.

These sites range from the very small in size such as unoccupied sites supporting a single navigational aid that sit on less than one-half acre, to the Army's vast White Sands Missile Range in New Mexico with over 3.6 million acres, or the Navy’s large complex of installations at Norfolk, Virginia with more than 78,000 employees.

The mission of the Department of Defense is to provide the military forces needed to deter war and to protect the security of our country. The department's headquarters is at the Pentagon.

The mission of <a href="http://www.defense.gov/"target="_blank">Defense.gov</a> 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, Defense.gov is the single, unified starting point for finding military information online.

This mission is consistent with the DoD Principles of Information, which outline the Department's policy for providing information to military members, DoD civilians, military family members, the American public, the Congress, and the news media. The information you find here is cleared for public release in accordance with applicable DoD policies.
Geographic AreaUnited States - includes all Pennsylvania counties: Adams, Allegheny, Armstrong, Beaver, Bedford, Berks, Blair, Bradford, Bucks, Butler, Cambria, Cameron, Carbon, Centre, Chester, Clarion, Clearfield, Clinton, Columbia, Crawford, Cumberland, Dauphin, Delaware, Elk, Erie, Fayette, Forest, Franklin, Fulton, Greene, Huntingdon, Indiana, Jefferson, Juniata, Lackawanna, Lancaster, Lawrence, Lebanon, Lehigh, Luzerne, Lycoming, McKean, Mercer, Mifflin, Monroe, Montgomery, Montour, Northampton, Northumberland, Perry, Philadelphia, Pike, Potter, Schuylkill, Snyder, Somerset, Sullivan, Susquehanna, Tioga, Union, Venango, Warren, Washington, Wayne, Westmoreland, Wyoming, York
 
Contact Information
Physical Site Address 11400 Defense Pentagon
Physical Site City, State, ZipWashington, DC 20301-1400
Main Phone703-571-3343
Web Addresswww.defense.gov
 
Affiliated Programs and Services
This Agency: United States Department of Defense
Affiliated Programs: Defense Centers of Excellence for Psychological Health and Traumatic Brain Injury
United States Department of Defense
United States Department of Defense, Defense Health Agency
United States Department of Defense, Military Health System
United States Department of Defense, Military OneSource
United States Department of Defense, National Center for Telehealth & Technology
United States Department of Defense, National Guard of the United States
United States Department of Defense, United States Army Reserve
United States Department of Defense, United States Department of the Army
United States Department of Defense, United States Department of the Navy
United States Department of the Army, United States Army Warrior Transition Command
Affiliated Services: Defense Centers of Excellence, Defense and Veterans Brain Injury Center
Defense Centers of Excellence Outreach Center
National Guard of the United States
National Guard of the United States - Employer Support Of The Guard and Reserve
National Guard of the United States - Financial Management Awareness Program (FMAP)
National Guard of the United States - National Guard Family Program
National Guard of the United States - Psychological Health Program
National Guard of the United States - Sexual Assault Prevention and Response Program
National Guard of the United States - Transition Assistance Program
United States Army
United States Army Warrior Transition Command - Warrior Care and Transition Program
United States Army Warrior Transition Command - Wounded Soldier and Family Hotline
United States Department of Defense
United States Department of Defense - Army Credentialing Opportunities On-Line (COOL)
United States Department of Defense, Army OneSource
United States Department of Defense, Defense Health Agency
United States Department of Defense, Defense Health Agency - Defense Enrollment Eligibility Reporting System (DEERS)
United States Department of Defense, Defense Health Agency - TRICARE
United States Department of Defense - Hero 2 Hired
United States Department of Defense - Homeowners Assistance Program
United States Department of Defense, Military Health System
United States Department of Defense, Military OneSource
United States Department of Defense, Military OneSource - Counseling
United States Department of Defense, Military OneSource - Educational Materials
United States Department of Defense, Military OneSource - Specialized Information and Referral
United States Department of Defense - Military Spouse Career Advancement Account
United States Department of Defense, National Center for Telehealth and Technology - AfterDeployment
United States Department of Defense, National Center for Telehealth and Technology - Military Families Near and Far
United States Department of Defense, National Center for Telehealth and Technology - MilitaryKidsConnect
United States Department of Defense, National Center for Telehealth and Technology - MilitaryParenting
United States Department of Defense, National Center for Telehealth and Technology - Military Pathways
United States Department of Defense, National Center for Telehealth and Technology - Moving Forward
United States Department of Defense, National Center for Telehealth & Technology
United States Department of Defense - Troops to Teachers Program
United States Department of Defense, United States Army Reserve
United States Department of the Army, United States Army Warrior Transition Command
United States Department of the Navy, Civilian Human Resources
United States Department of the Navy, Disabled Veterans Assistance Line
United States Marine Corps
United States Navy