The Transport. Security Admin¿s. (TSA) mission is to protect the nation¿s transport. network. Since its inception in 2001, TSA has developed and implemented a variety of programs and procedures to secure commercial aviation and surface modes of transport. Other DHS components, fed. agencies, state and local governments, and the private sector also play a role in transport. security. Previous reports have examined: (1) the progress TSA and other DHS components have made in securing the nation¿s aviation and surface transport. systems, and the challenges that remain; and (2) crosscutting issues that have impeded TSA¿s efforts in strengthening security. This testimony concerns the security of the nation¿s aviation and surface transport. systems.