Central Intelligence Agency -

http://www.cia.gov

National Security Agency-

http://www.nsa.gov/

Defense Intelligence Agency -

http://www.dia.mil/

National Geospatial Intelligence Agency -

http://www.nga.mil/portal/site/nga01/

National Reconnaissance Intelligence Agency -

http://www.fas.org/irp/nro/

Department of Army -

http://www.army.mil/

Department of Air Force -

http://www.af.mil/

Department of Navy -

http://www.navy.mil/

Department of Navy, Marine Corps - 

http://www.usmc.mil/marinelink/mcn2000.nsf/frontpagenews

United States Coast Guard -

http://www.uscg.mil/USCG.shtm

Homeland Security -

http://www.dhs.gov/dhspublic/

Federal Bureau of Investigation -

http://www.fbi.gov/

U.S. Department of Treasury -

http://www.ustreas.gov/

U.S. Department of Energy -

http://www.energy.gov/

U.S. Department of State - 

http://www.state.gov/