Emergency management -- Terrorism -- 4 Civil defense -- 2 Prevention -- 2 Citizen participation -- 1 Defenses 1 Disaster relief -- 1 more ... Emergency communication system -- 1 International cooperation 1 National security -- 1 Natural disasters -- 1 Prevention. -- 1 Safety measures 1 Self-defense -- 1 Weapons of mass destruction 1 Weapons of mass destruction -- 1 less ...