Emergency management -- Terrorism -- Prevention -- 5 National security -- 4 Civil defense -- 2 Citizen participation -- 1 Congresses 1 more ... Defenses 1 Emergency communication system -- 1 Government policy 1 Government policy -- 1 Natural disasters -- 1 Political planning -- 1 Prevention. -- 1 Safety measures 1 Self-defense -- 1 Weapons of mass destruction 1 Weapons of mass destruction -- 1 less ...