Emergency management -- Prevention -- Terrorism -- 5 National security -- 3 Civil defense -- 2 Congresses 2 Biological warfare 1 more ... Biological weapons 1 Bioterrorism -- 1 Citizen participation -- 1 Defenses 1 Emergency communication system -- 1 Emergency managemen 1 Epidemics -- 1 Government policy 1 Government policy -- 1 History -- 1 Influenza -- 1 Political planning -- 1 Prevention 1 Public health -- 1 Self-defense -- 1 Weapons of mass destruction 1 less ...