National security National security -- Civil defense 1 Civil defense -- 1 Decision making 1 Defenses 1 Developing countries -- 1 more ... Harbors -- 1 Merchant marine -- 1 Military assistance, American 1 Military relations 1 Military relations -- 1 Munitions -- 1 Politics and government -- 1 Prevention 1 Security measures 1 Security measures -- 1 Terrorism -- 1 War on Terrorism, 2001-2009 1 less ...