Terrorism -- National security -- 10 Prevention 4 United States 4 Foreign relations 2 Foreign relations -- 2 International relations 2 more ... Pirates -- 2 Prevention. -- 2 Security Management 2 Security, International 2 Terrorism 2 Terrorists -- 2 War on terrorism, 2001- 2 Civil defense -- 1 Civil security -- 1 Economic development 1 Emergency management -- 1 Government policy -- 1 Homeland security 1 Infrastructure -- 1 International cooperation 1 International offenses 1 Law enforcement -- 1 Military policy 1 National security 1 Naval strategy 1 Navigation -- 1 Piracy -- 1 Political stability 1 less ...