Prevention 6 Terrorism -- 6 United States 3 Foreign relations 2 National security -- 2 Civil security -- 1 Economic development 1 more ... Homeland security 1 Infrastructure -- 1 International cooperation 1 International offenses 1 Iraq War, 2003 1 Military policy 1 Politics & government 1 Safety measures 1 Security Management 1 Security measures 1 September 11 Terrorist Attacks, 2001 1 Transportation -- 1 War on terrorism, 2001- 1 less ...