National Security Agency (redirected from United States Signals Intelligence Directive 18)

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Noun

1.

National Security Agency - the United States cryptologic organization that coordinates and directs highly specialized activities to protect United States information systems and to produce foreign intelligence information NSA Defense Department, Department of Defense, DoD, United States Department of Defense, Defense - the federal department responsible for safeguarding national security of the United States; created in 1947 United States intelligence agency - an intelligence service in the United States IC, Intelligence Community, National Intelligence Community, United States Intelligence Community - a group of government agencies and organizations that carry out intelligence activities for the United States government; headed by the Director of Central Intelligence