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National security describes the measures taken by a state to ensure its survival and security.

Measures taken to ensure national security include:

• the maintenance of armed forces
• civil defence measures and emergency preparedness
• attempts to create resilience and redundancy in national infrastructure
• the maintenance of intelligence services to detect threats
• the protection of classified information

See also:

• Nuclear deterrence

National Security is also a movie, made in 2003, starring Martin Lawrence. See National Security (movie) .