From the Defense Technical Information Center webpage abstract: "It was not long after the attacks of September 11th that government officials began discussing other avenues that terrorists might use to attack American citizens, particularly in the maritime domain. In a speech delivered in January 2002, President George W. Bush noted, 'The heart of the Maritime Domain Awareness program is accurate information, intelligence, surveillance, and reconnaissance of all vessels, cargo, and people extending well beyond our traditional maritime boundaries.' By November 2002 Congress had passed the Maritime Transportation Security Act of 2002. The National Security Council and the president continued to explore issues surrounding the safety and security of the U.S. maritime environs. In December 2004, the president signed National Security Presidential Directive 41/Homeland Security Presidential Directive 13, which established policy guidelines. It also directed the secretaries of Homeland Security and Defense to lead the federal effort in developing a comprehensive national strategy that would better integrate and synchronize existing department-level strategies and ensure their effective and efficient implementation. The interagency Maritime Security Policy Coordinating Committee was established to serve as the primary forum for coordinating government maritime security policies; it delivered a National Strategy for Maritime Security in September 2005. Eight additional plans, including the National Plan to Achieve Maritime Domain Awareness, buttress the national strategy."
Defense Technical Information Center (DTIC): http://www.dtic.mil/dtic/
Naval War College Review (Summer 2009), v.62 no.3, p.137-146