Government policy National security Military policy 20 Prevention 15 Nuclear weapons 13 Terrorism 11 History 10 more ... Security, International 7 Weapons of mass destruction 7 Cyberterrorism 5 Foreign relations 5 Armed Forces 4 Cyberspace 4 Deterrence (Strategy) 4 Drone aircraft 4 Evaluation 4 Information warfare 4 Targeted killing 4 Defenses 3 Information technology 3 Militarism 3 Moral and ethical aspects 3 Nuclear arms control 3 Nuclear disarmament 3 Nuclear nonproliferation 3 Security measures 3 Social aspects 3 Technological innovations 3 World politics 3 Arms race 2 less ...