Terrorism -- 33 Prevention. -- 27 National security -- 10 Prevention -- 8 Government policy -- 6 War on Terrorism, 2001-2009 5 Civil defense -- 4 more ... Islam 4 Religious aspects -- 4 Terrorists -- 4 Evaluation. -- 3 Intelligence service -- 3 Politics and government -- 3 Security measures 3 Aeronautics, Commercial -- 2 Civil rights -- 2 Emergency management -- 2 Foreign relations -- 2 Internal security -- 2 Islamic fundamentalism -- 2 Prevention 2 Psychological aspects 2 Terrorism 2 Air power -- 1 Business -- 1 Business enterprises -- 1 Combatants and noncombatants (International Law) 1 Computer network resources 1 Crisis management 1 Detention of persons -- 1 less ...