Defenses National security -- 3 Prevention -- 2 Terrorism -- 2 Weapons of mass destruction 2 Asymmetric warfare -- 1 Civil defense -- 1 more ... Conflict management -- 1 Emergency management -- 1 Foreign relations 1 Foreign relations -- 1 Government policy -- 1 Military policy 1 Military relations -- 1 Nuclear terrorism 1 Nuclear weapons -- 1 Security, International 1 Strategic aspects 1 less ...