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