National security -- 182 Security, International 113 Foreign relations -- 52 Terrorism -- 45 Foreign relations 40 Military policy 38 World politics -- 37 more ... National security 33 Politics and government -- 33 Security measures 27 Congresses -- 23 Congresses 21 Security, International -- 20 Strategic aspects 20 Prevention. -- 18 International cooperation 17 International relations 17 Computer security 16 Politics and government 16 Terrorism 16 Computer networks -- 15 Defenses 14 Internal security -- 13 Prevention 13 Government policy -- 11 Peace 11 Armed Forces 10 History -- 10 Prevention -- 10 Intervention (International Law) 9 less ...