Prevention. -- Terrorism -- 32 National security -- 12 Government policy -- 8 Terrorists -- 5 War on Terrorism, 2001-2009 5 Civil defense -- 4 more ... Evaluation. -- 3 Intelligence service -- 3 Islam 3 Politics and government -- 3 Prevention 3 Religious aspects -- 3 Security measures 3 Aeronautics, Commercial -- 2 Civil rights -- 2 Foreign relations -- 2 International cooperation 2 Terrorism 2 Air power -- 1 Business -- 1 Business enterprises -- 1 Cold War -- 1 Combatants and noncombatants (International Law) 1 Computer network resources 1 Conflict management -- 1 Cyberterrorism -- 1 Detention of persons -- 1 Drug control -- 1 Economic aspects 1 less ...