National security -- War on Terrorism, 2001-2009 Terrorism -- 4 Government policy -- 3 Intelligence service -- 2 September 11 Terrorist Attacks, 2001 2 Afghan War, 2001- -- 1 more ... Civil defense 1 Civil defense -- 1 Decision making 1 Decision making. -- 1 Defenses 1 Economic aspects -- 1 Evaluation. -- 1 Foreign relations -- 1 Government spending policy -- 1 Governmental investigations -- 1 Harbors -- 1 Merchant marine -- 1 Military policy -- 1 Military relations -- 1 National security 1 Officials and employees 1 Political violence -- 1 Politics and government -- 1 Prevention 1 Prevention. -- 1 Risk management -- 1 Security measures 1 Security measures -- 1 less ...