Investments in amphibious capabilities by U.S. partners and allies in the Asia Pacific is altering the range of capabilities available in that region. It is also changing the types and frequency of exercises partner nations seek to undertake with the U.S. Navy and Marine Corps team. This study examines ally- and partner-nation investments in amphibious capabilities, how those capabilities will impact demand for U.S. forces, and the range of U.S. amphibious fleet composites to meet the changing demand.