Defenses National security -- 6 Civil defense -- 4 Military policy 4 Armed Forces 3 Terrorism -- 3 World politics -- 3 more ... Armed Forces -- 2 Armed forces 2 Emergency management -- 2 Military relations -- 2 Politics and government -- 2 Prevention -- 2 War on Terrorism, 2001-2009 2 Weapons of mass destruction 2 Appropriations and expenditures 1 Armed forces -- 1 Asymmetric warfare -- 1 Civil defense 1 Defenses -- 1 Disarmament 1 Disaster relief -- 1 Economic aspects 1 Government policy -- 1 Harbors -- 1 Merchant marine -- 1 Military planning -- 1 National security 1 Nuclear arms control 1 Nuclear terrorism 1 less ...