National security -- Terrorism -- Prevention. -- 8 Prevention -- 5 Government policy -- 3 Civil defense -- 2 Intelligence service -- 2 more ... International cooperation 2 Law and legislation 2 Military policy 2 Politics and government -- 2 Prevention 2 Security measures 2 Terrorism 2 Terrorists -- 2 War on Terrorism, 2001-2009 2 Air power -- 1 Civil defense 1 Civil rights -- 1 Defenses 1 Deterrence(strategy) 1 Droit 1 Droits de l'homme (Droit international) 1 Emergency management -- 1 Foreign relations 1 Foreign relations -- 1 Government policy 1 Governmental investigations -- 1 Harbors -- 1 History -- 1 less ...