Terrorism -- Government policy -- 5 Prevention -- 4 Foreign relations -- 3 Economic sanctions, American 2 National security -- 2 Politics and government 2 more ... Relations 2 Air power -- 1 Case studies 1 Civil defense -- 1 Defenses 1 Emergency management -- 1 Government policy 1 Information warfare -- 1 Intelligence service -- 1 Military policy 1 Politics and government -- 1 Prevention. -- 1 Security measures 1 Subversive activities -- 1 Terrorism 1 War on terrorism, 2001- 1 less ...