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