This is an edited volume that examines the US-Japan security alliance, the key to US-Japanese relations since the end of US occupation in the 50s. The alliance has long been a source of both co-operation and stress between the two nations, but with rapid changes in Asia, it has grown more problematic. This book brings American and Japanese specialists together to examine the alliance within the wider regional environment and to determine whether and how the bilateral alliance can evolve and remain at the core of the region's security order.