Defenses 8 National security -- 8 Defenses -- 4 Economic aspects 4 Civil defense -- 3 Military policy 3 Terrorism -- 3 more ... Emergency management -- 2 Politics and government -- 2 Prevention -- 2 Weapons of mass destruction 2 Asymmetric warfare -- 1 Civil defense 1 Disarmament -- 1 Disaster relief -- 1 Economic aspects -- 1 Economic convention -- 1 Foreign relations -- 1 Government policy -- 1 Harbors -- 1 Merchant marine -- 1 Military industrial complex -- 1 Military weapons 1 National security 1 Nuclear terrorism 1 Nuclear weapons -- 1 Post-Cold War 1 Prevention 1 Security measures 1 Security measures -- 1 less ...