While contract award marks a significant milestone for the Deepwater program, it is important to acknowledge-edge the importance of the partnership between the Navy and Coast Guard that helped make the Deepwater vision a reality. The two services have a long history of cooperation in national security missions, but the Deepwater program is the product of a new level of collaboration, continuing the tradition of productive Navy-Coast Guard cooperation, producing benefits for both services and enabling them to execute the security missions of the 21st century. For more than five years, the Navy has been an active participant in several parts of the Deepwater effort. As early as 1997, the chief of naval operations staff issued naval operational capabilities for the National Security Cutter in order to ensure interoperability with Naval assets. Additionally, Naval personnel have made significant contributions to tests and evaluations, design feasibility assessments, and are members of several Deepwater management teams. This article further explores and outlines the relationship between the Coast Guard and the Navy as it relates to Homeland Security.