The following are some sites that are of important reference
Central Intelligence Agency (CIA) https://www.cia.gov/ THE WORK OF A NATION. THE CENTER OF INTELLIGENCE.
Central Security Service (CSS) http://www.nsa.gov/
Homeland Security (HS) http://www.dhs.gov/index.shtm
In-Q-Tel http://www.iqt.org/ ACCELERATING INNOVATION for the Intelligence Community
National Security Agency (NSA) http://www.nsa.gov/
National Security Council (NSC) http://www.whitehouse.gov/administration/eop/nsc/