World politics International relations 20 Foreign relations 12 Security, International 12 Military policy 10 War 8 History 6 National security 6 Encyclopedias 5 Periodicals 5 Terrorism 5 United States 5 Armed Forces 4 Cold War 4 Globalization 4 Maps 4 Military art and science 3 Political aspects 3 Politics and government 3 Strategy 3 Case studies 2 Geopolitics 2 Human rights 2 Information warfare 2 International politics 2 Management 2 Nuclear arms control 2 Nuclear nonproliferation 2 Peacekeeping forces 2 September 11 Terrorist Attacks, 2001 2