National security 645 Security, International 323 Foreign relations 156 Military policy 154 Security measures 120 Thesis 118 Dissertations, Academic 89 Computer security 88 Politics and government 81 World politics 81 Terrorism 71 Defenses 70 Prevention 68 Congresses 60 International relations 55 Computer networks 51 Strategic aspects 51 History 48 Armed Forces 38 Government policy 37 Law and legislation 35 United States 35 Internal security 33 National Security 28 Pacific Area 28 Strategy 28 Arms control 26 International cooperation 25 Asia 23 Data protection 23