History 326 Armed Forces 157 Aims and objectives 119 Politics and government 92 World War, 1939-1945 73 Education, Higher 64 Education 58 History, Military 48 Social aspects 44 Foreign relations 43 History and criticism 39 Military policy 37 Campaigns 34 World War, 1914-1918 29 Universities and colleges 28 Political activity 27 Management 26 Design and construction 25 Political aspects 25 Social conditions 25 Biography 24 Philosophy 24 Arms control 23 Soldiers 21 Nuclear arms control 20 Research 20 Materials 19 Terrorism 19 Armed forces 18 Data processing 18