National security -- Foreign relations -- 27 Military policy 18 World politics -- 9 Foreign relations 8 Defenses 7 Military relations -- 7 more ... Terrorism -- 7 Politics and government -- 6 Security, International 6 Decision making 5 Relations -- 5 Defenses -- 4 History -- 4 Decision making -- 3 Economic aspects 3 Government policy -- 3 National security 3 Prevention. -- 3 War on Terrorism, 2001-2009 3 Armed Forces -- 2 Armed forces 2 Civil defense -- 2 History 2 Military policy -- 2 North Atlantic Treaty Organization 2 Officials and employees 2 Prevention -- 2 Sea-power -- 2 Security measures 2 less ...