Prevention Terrorism 27 National security 12 Military policy 10 Security measures 9 Biological warfare 8 Bioterrorism 8 more ... Government policy 8 Information warfare 8 Civil defense 7 Armed Forces 6 Biological weapons 6 Cyberspace 6 Cyberterrorism 6 Emergency management 6 History 6 Computer networks 5 Counterinsurgency 5 Research 5 Safety measures 5 Insurgency 4 Security, International 4 War 4 Weapons of mass destruction 4 Asymmetric warfare 3 Evaluation 3 Moral and ethical aspects 3 Planning 3 Psychology, Military 3 Soldiers 3 less ...