Government policy -- National security -- 11 Terrorism -- 9 Prevention -- 4 Foreign relations 3 History -- 3 National security 3 more ... War on Terrorism, 2001-2009 3 Intelligence service -- 2 Nuclear weapons -- 2 Plutonium -- 2 Prevention. -- 2 September 11 Terrorist Attacks, 2001 2 Civil defense -- 1 Civil rights -- 1 Civil war -- 1 Computer networks -- 1 Computer security -- 1 Congresses -- 1 Cross- cultural studies 1 Defenses 1 Emergency management -- 1 Evaluation. -- 1 Foreign relations -- 1 Governmental investigations -- 1 Human rights -- 1 Humanitarian assistance -- 1 Internally displaced persons -- 1 Nuclear non-proliferation 1 Nuclear nonproliferation 1 less ...