National security Terrorism 33 Politics and government 30 Prevention 30 Foreign relations 26 Security, International 21 Intelligence service 15 Regionalism 15 Military policy 14 Security measures 12 History 11 Internal security 11 Southeast Asia 11 United States 11 Civil defense 8 Government policy 8 Asia 7 Defenses 7 Law enforcement 7 Economic aspects 6 Energy policy 6 Environmental policy 6 Globalization 6 International cooperation 6 Japan 6 Political aspects 6 Safety measures 6 China 5 Decision making 5 East Asia 5