National security Politics and government -- Foreign relations -- 3 Defenses 2 History -- 2 Military policy 2 National security -- 2 more ... Civil -- 1 Civil defense 1 Civil defense -- 1 Decision making 1 Diplomatic negotiations in international disputes 1 Diplomatic relations 1 Economic conditions -- 1 Harbors -- 1 International relations 1 Merchant marine -- 1 Prevention 1 Security measures 1 Security measures -- 1 Terrorism -- 1 War on Terrorism, 2001-2009 1 military relations -- 1 less ...