National security Prevention Terrorism 323 Government policy 110 Security measures 57 Law and legislation 51 Emergency management 41 more ... Intelligence service 39 Evaluation 34 Civil rights 30 Cyberterrorism 25 Civil defense 22 Finance 21 War on Terrorism, 2001-2009 20 Technological innovations 19 Rules and practice 18 International cooperation 17 Military policy 17 Foreign relations 16 Management 15 Planning 15 September 11 Terrorist Attacks, 2001 15 Computer security 13 Internal security 13 Bioterrorism 12 Computer networks 12 Defenses 12 Risk assessment 12 Security, International 12 History 11 less ...