Prevention -- Terrorism -- 15 Government policy -- 8 Foreign relations -- 5 National security -- 5 History -- 4 Civil rights -- 3 more ... Civil defense -- 2 Defenses 2 Emergency management -- 2 Military policy 2 Politics and government -- 2 Prevention 2 War on terrorism, 2001- 2 Administrative agencies -- 1 Asymmetric warfare -- 1 Biological warfare 1 Biological weapons 1 Bioterrorism -- 1 Case studies 1 Computer networks -- 1 Computer security -- 1 Counterinsurgency -- 1 Cross- cultural studies 1 Cyber intelligence (Computer security) -- 1 Disasters -- 1 Economic sanctions, American 1 Foreign relations 1 Government policy 1 Guerrillas -- 1 less ...