The Naval War College has expanded its expertise in the Asia-Pacific Rim region in recent years largely in response to the growing significance of the region to U.S. national security. The College has actively hired prominent scholars and hosted a number of conferences, workshops, and guest speakers focusing on the problems and possibilities facing the Pacific Rim. South and Northeast Asia, after all, are home to some of the world's fastest-growing economies and close American allies, as well as several potential political and diplomatic flashpoints. Even more to the point, China is an ascending economic and military power both in the region and on the world stage. The U.S. Navy plays a leading role in maintaining stability in the region with its strong presence and ability to guard the freedom of navigation in vital sea lines of communication. The efforts of the Asia-Pacific Rim specialists at the Naval War College in some ways represent a case of "back to the future." One of the proudest episodes in the College's history came in the 1930s when Newport played a central role in developing the military plans necessary to cope with the ascendance of another Asian economic and military power-Japan. Although we expect that wise diplomacy and national self-interest will prevent a reoccurrence of similar difficulties in the coming decades, there is no substitute for military preparedness and well-thought-out international and regional strategies for dealing with the important region. The Naval War College Press has done its part in providing its readers with many excellent articles on regional security in Asia in the Naval War College Review; an important book-Jonathan Pollack, editor, Strategic Surprise? U.S.-China Relations in the Early Twenty-first Century (released March 2004); and now Newport Paper 22. Professor Lyle Goldstein of the Strategic Research Department of the College's Center for Naval Warfare Studies has been at the forefront of recent research into China's future. In this project he has guided a handful of naval officers through the puzzle of China's ongoing nuclear modernization programs. With the able assistance of Andrew Erickson, these sailor-scholars have examined various aspects of nuclear modernization from ballistic missile defense to nuclear command and control. In general the chapter tells a cautionary tale; the progress of China's nuclear modernization documented here should give pause to those inclined to dismiss China's military modernization. Steadily and with relatively little attention the People's Republic continues to improve its technologies and weapons systems. As the authors emphasize, no "Rubicon" has been crossed, but potentials are already apparent that, if realized, the U.S. Navy as now constituted would find challenging indeed.