Foreign relations 635 History 321 Military policy 228 United States 199 Politics and government 169 Armed Forces 164 National security 151 Biography 112 Terrorism 112 World politics 104 Prevention 81 Government policy 66 Thesis 63 Intelligence service 56 Dissertations, Academic 52 Defenses 48 Military relations 46 Case studies 45 Relations 45 Law and legislation 42 Military art and science 42 Congresses 40 History, Military 38 Army 35 Education 35 Presidents 35 Social conditions 35 Handbooks, manuals, etc 34 Military planning 34 Strategy 34