National security -- Foreign relations -- 15 Military policy 8 Terrorism -- 7 Foreign relations 6 World politics -- 5 Military relations -- 4 more ... Security, International 4 Defenses 3 Politics and government -- 3 Prevention. -- 3 War on Terrorism, 2001-2009 3 International relations 2 North Atlantic Treaty Organization 2 Prevention 2 Relations -- 2 Security measures 2 United States 2 War (International law) 2 1976- 1 Afghan War, 2001- -- 1 Air power -- 1 Armed Forces -- 1 Civil defense 1 Civil defense -- 1 Courts -- 1 Decision making 1 Decision making. -- 1 Economic development 1 Forecasting -- 1 less ...