Prevention Terrorism -- 3 War on Terrorism, 2001-2009 Civil defense 1 Civil defense -- 1 Counterinsurgency -- 1 Defenses 1 more ... Foreign relations -- 1 Globalization 1 Harbors -- 1 Merchant marine -- 1 National security 1 National security -- 1 Politics and government -- 1 Security measures 1 Security measures -- 1 September 11 Terrorist Attacks, 2001 1 Special forces (Military science) -- 1 less ...