Maritime

International Maritime Organization (IMO)
http://www.imo.org/Pages/home.aspx
United States Coast Guard (USCG)
http://www.uscg.mil/

International Security And Intelligence

Department of Homeland Security (DHS)
Central Intelligence Agency (CIA)
Federal Bureau of Investigation (FBI)
International Police Agency (INTERPOL)
National Security Agency (NSA)

Infromation Technology

The U.S. Computer Emergency Response Team
http://www.us-cert.gov/
Computer Security Institute
http://gocsi.com/
The Information Systems Security Association
http://www.issa.org

Procurement

Armored Vehicles
http://www.armored-v.com