National security -- Terrorism -- Prevention -- 12 Prevention. -- 11 Government policy -- 9 Civil defense -- 5 International cooperation 5 more ... Civil rights -- 4 Foreign relations -- 4 History -- 4 War on Terrorism, 2001-2009 4 Emergency management -- 3 Foreign relations 3 Intelligence service -- 3 Pirates -- 3 Politics and government -- 3 Terrorists -- 3 Defenses 2 Law and legislation 2 Law enforcement -- 2 Military policy 2 Naval strategy 2 Prevention 2 Sea control -- 2 Security measures 2 September 11 Terrorist Attacks, 2001 2 Southeast Asia -- 2 Terrorism 2 War on terrorism, 2001- 2 Air power -- 1 less ...