World politics Foreign relations 57 Military policy 25 National security 18 United States 13 International relations 10 Forecasting 7 History 7 Defenses 6 War on terrorism, 2001- 6 21st century 4 Armed Forces 4 Cold War 4 Hegemony 4 Security, International 4 Forecasts 3 Military planning 3 Nuclear weapons 3 Periodicals 3 Political aspects 3 September 11 Terrorist Attacks, 2001 3 Twenty-first century 3 Air defenses 2 Arms race 2 Balance of power 2 Case studies 2 Causes 2 Economic policy 2 Great Britain 2 Great powers 2