Civil defense -- Terrorism -- 8 National security -- 5 Defenses 4 Prevention. -- 4 Emergency management -- 3 Prevention -- 3 more ... War on Terrorism, 2001-2009 2 Armed Forces -- 1 Citizen participation -- 1 Civil defense 1 Civil rights -- 1 Disaster relief -- 1 Government policy -- 1 Harbors -- 1 Law enforcement -- 1 Merchant marine -- 1 Military planning -- 1 National security 1 Organization 1 Politics and government -- 1 Prevention 1 Security measures 1 Security measures -- 1 Self-defense -- 1 less ...