As part of our Technical Security Evaluation Program, we evaluated technical and information security policies and procedures of Department of Homeland Security components at the John F. Kennedy International Airport. Four Department components – the Transportation Security Administration, U.S. Customs and Border Protection, U.S. Immigration and Customs Enforcement, and U. S. Secret Service – operate information technology systems that support homeland security operations at this major airport. Our evaluation focused on how these components have implemented operational, technical, and management controls for computer security at the airport and nearby locations. We performed onsite inspections of the areas where these assets were located, interviewed departmental staff, and conducted technical tests of computer security controls. We also reviewed applicable policies, procedures, and other relevant documentation. The Department’s sensitive system security policies, the information technology security controls implemented at several sites had deficiencies that, if exploited, could have resulted in the loss of confidentiality, inte grity, and availability of the components’ information technology systems.