Emergency management -- Terrorism -- Prevention -- 4 National security -- 3 Citizen participation -- 1 Civil defense -- 1 Congresses 1 more ... Emergency communication system -- 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 ...