Government policy -- Terrorism -- 24 Foreign relations -- 13 War on Terrorism, 2001-2009 9 Prevention -- 8 National security -- 6 Prevention. -- 5 more ... September 11 Terrorist Attacks, 2001 4 Evaluation. -- 3 Intelligence service -- 3 Nuclear weapons -- 3 Politics and government -- 3 Terrorism 3 Aeronautics, Commercial -- 2 Case studies 2 Computer networks -- 2 Computer security -- 2 Democracy -- 2 Economic sanctions, American 2 History -- 2 Human rights -- 2 Islam 2 Jihad 2 Military policy 2 Nuclear arms control -- 2 Politics and government 2 Relations 2 Religious aspects -- 2 Security measures 2 Security measures -- 2 less ...