The growth of the terrorism threat to the nation’s security has created significant strategic challenges for U.S. armed forces in fighting this global war on terrorism (GWOT). For the Navy, the challenges have centered on developing maritime capabilities to prosecute the GWOT as far forward as possible. To assist the Navy’s planning in this area, the former Chief of Naval Operations requested the NRC to conduct an assessment of the adequacy of and prospects for improving the role of Naval Forces in the GWOT. The study developed a defense-in-depth framework as the organizing principle for the report. The report contains information as described in 5 U.S.C. 552(b) and therefore could not be released to the public in its entirety. The public version consists of an executive summary that presents an assessment of the transformation of naval forces for addressing the GWOT; a brief description of the defense-in-depth framework; and a list of findings and major recommendations.