World politics Military policy 23 National security 15 International relations 12 Foreign relations 11 Military art and science 10 Security, International 10 War 10 Forecasting 9 History 9 Terrorism 9 United States 9 Defenses 8 September 11 Terrorist Attacks, 2001 7 Armed Forces 6 War on terrorism, 2001- 6 Balance of power 4 Geopolitics 4 Nuclear nonproliferation 4 Globalization 3 Imperialism 3 Information warfare 3 Iraq War, 2003 3 Nuclear warfare 3 Nuclear weapons 3 Political aspects 3 Political violence 3 Prevention 3 Sea-power 3 Strategic aspects 3