Government Response Preventive Measures Radicalization Counterterrorism Law Enforcement Public Safety Domestic Terrorism Legislation Law Enforcement Actions Counterterrorism Strategy Law Enforcement Agencies Law Enforcement Coordination Foreign Terrorist Organizations Military Justice Gun Control Legal Framework Defense Industry Public Perception Public Safety Measures Law Enforcement Response Responses to Terrorism Counterterrorism Strategies Foreign Relations Judicial System FBI Legal Prosecution International Cooperation Response to Terrorism Post-9/11 Legislation Media Influence Public Response Youth Radicalization Commemoration Policies Immigration Policy Counterterrorism Efforts Extremism