National security -- Terrorism -- Prevention. -- 11 Prevention -- 6 Government policy -- 5 War on Terrorism, 2001-2009 4 Civil defense -- 3 more ... Intelligence service -- 3 International cooperation 3 Terrorists -- 3 Emergency management -- 2 Foreign relations 2 Foreign relations -- 2 Law and legislation 2 Military policy 2 Pirates -- 2 Politics and government -- 2 Prevention 2 Security measures 2 September 11 Terrorist Attacks, 2001 2 Terrorism 2 Air power -- 1 Civil defense 1 Civil rights -- 1 Defenses 1 Deterrence(strategy) 1 Droit 1 Droits de l'homme (Droit international) 1 Evaluation. -- 1 Government policy 1 less ...