Prevention -- Emergency management -- 4 Terrorism -- 4 Civil defense -- 2 Biological warfare 1 Biological weapons 1 Bioterrorism -- 1 more ... Citizen participation -- 1 Crisis management 1 Defenses 1 Emergency communication system -- 1 Government policy -- 1 History -- 1 Hostages 1 National security -- 1 Public health -- 1 Self-defense -- 1 Weapons of mass destruction 1 White House 1 less ...