The NCIS mission is to investigate and defeat criminal, terrorist, and foreign intelligence threats to the United States Navy and Marine Corps-ashore, afloat, and in cyberspace.
A Timeline of Historical Events 

1882: NCIS Origin In The Office Of Naval Intelligence
1916: Countering Espionage And Sabotage
1935-1945: Counterintelligence And Criminal Investigations
1966: Naval Investigative Service Established
1970s: Special Agent Afloat Program And Marine Special Agents
Early 1980s: FLETC And The ATAC

1985-1988: Evolution In Mission And Name
Early 1990s: Naval Criminal Investigative Service
1996: New NCIS Structure
Early 2000s: Expanded Authorities
2005-Present: Today's NCIS

This is an official U.S. Navy web site.
Naval Criminal Investigative Service
27130 Telegraph Road, Quantico, VA 22134

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