History 86 Politics and government 44 Foreign relations 43 Defenses 37 World War, 1939-1945 37 National security 32 Military policy 28 Europe 19 Military art and science 18 Campaigns 16 Congresses 14 North Atlantic Treaty Organization 14 Security, International 14 Islam 13 World politics 13 Armed Forces 12 Military relations 11 Relations 11 History, Military 10 Arms control 9 Juvenile literature 9 Causes 8 Economic conditions 8 Biography 7 Civilization 7 Terrorism 7 World War, 1914-1918 7 Economic aspects 6 International relations 6 Revolutions 6