We audited security controls for Department of Homeland Security Information technology systems at Dallas/Fort Worth International Airport. Four Department components—the Management Directorate, Transportation Security Administration, U.S. Customs and Border Protection, and U.S. Immigration and Customs Enforcement—Operate information technology systems that support homeland security operations at this airport. Our audit focused on how these components have implemented computer security operational, technical, and management controls for their systems at the airport and nearby locations.