Prevention. -- Terrorism -- 28 National security -- 9 Government policy -- 7 War on Terrorism, 2001-2009 5 Civil defense -- 4 Terrorists -- 4 more ... Evaluation. -- 3 Intelligence service -- 3 Islam 3 Politics and government -- 3 Religious aspects -- 3 Security measures 3 Aeronautics, Commercial -- 2 Civil rights -- 2 Foreign relations -- 2 Air power -- 1 Business -- 1 Business enterprises -- 1 Cold War -- 1 Combatants and noncombatants (International Law) 1 Computer network resources 1 Detention of persons -- 1 Economic aspects 1 Effect of terrorism on 1 Emergency management -- 1 Executive power -- 1 Fear of crime -- 1 Foreign relations 1 Hate crime investigation 1 less ...