National security -- 28 Military policy 12 Defenses 5 Terrorism -- 5 Foreign relations -- 4 Politics and government -- 4 World politics -- 4 more ... Defenses -- 3 Economic aspects 3 Prevention. -- 3 Security, International 3 Armed forces 2 Civil defense -- 2 Foreign relations 2 National security 2 Security measures 2 Air power -- 1 Appropriations and expenditures 1 Armed Forces -- 1 Civil defense 1 Congress 1 Constructing out -- 1 Developing countries -- 1 Emergency management -- 1 Executive power -- 1 Foeign relations -- 1 Foreign relations - -- 1 Government contractors -- 1 Government policy -- 1 Harbors -- 1 less ...