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Securing the nation's transportation and information systems is a primary responsibility of the Department of Homeland Security (DHS). Within DHS, the Transportation Security Administration (TSA) is responsible for securing all transportation modes; U.S. Customs and Border Protection (CBP) is responsible for cargo container security; the U.S. Coast Guard is responsible for protecting the maritime environment; and the National Protection and Programs Directorate is responsible for the cybersecurity of critical infrastructure. This statement focuses on the progress and challenges DHS faces in key areas of maritime, aviation, and cybersecurity. It is based on GAO products issued from June 2004 through November 2009, as well as ongoing work on air cargo security. GAO reviewed relevant documents; interviewed cognizant agency officials; and observed operations at 12 airports, chosen by size and other factors. The results are not generalizable to all airports.

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