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- GCHQ - Government Communications Headquarters
- Official site of the UK Government Communications Headquarters which is the centre for Her Majesty's Government's Signal Intelligence (SIGINT) activities.
- National Security Agency - NSA/CSS
- National Security Agency/Central Security Service Public Information. The United States SIGINT, Cryptology and Technical Security Authority.
- Central Intelligence Agency - CIA
- The Central Intelligence Agency was created in 1947 with the signing of the National Security Act by President Harry S. Truman. The act also created a Director of Central Intelligence (DCI) to serve as head of the United States intelligence community; act as the principal adviser to the President for intelligence matters related to the national security; and serve as head of the Central Intelligence Agency. The Intelligence Reform and Terrorism Prevention Act of 2004 amended the National Security Act to provide for a Director of National Intelligence who would assume some of the roles formerly fulfilled by the DCI, with a separate Director of the Central Intelligence Agency.
- Communications Security Establishment Canada Homepage
- The Communications Security Establishment Canada (CSEC) is Canada's national cryptologic agency.
"We provide the Government of Canada with two key services: foreign signals intelligence in support of defence and foreign policy, and the protection of electronic information and communication."
- Records of the National Security Agency/Central Security Service
- Records of the National Security Agency/Central Security Service in the holdings of the U.S. National Archives and Records Administration. From the Guide to Federal Records in the National Archives of the U.S.
- Signals Intelligence - NSA/CSS
- National Security Agency -Signals Intelligence Definition and explanation.
- National Cryptologic Museum - NSA/CSS
- National Security Agency
- Naval Security Group Actvity PuertoRico
- The2,200-acreNavalSecurityGroupActivitysite,anavalcommunicationsstationwhichoperatesahigh-frequency directionfindingfacility,liesnexttoSabanaSeca
- National Reconnaissance Office : 50 Years of Vigilance From Above
- NRO is the U.S. Government agency in charge of designing, building, launching, and maintaining America’s intelligence satellites.
- NRO Jr. Home Page For Kids
- The National Reconnaissance Office's website for kids! Our goal is to engage children in the wonders of science, math and the history of reconnaissance in a fun and interactive manner.
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