The United States military has been building up forces on the U.S. territory of Guam to increase deterrence and power projection for possible responses to crises and disasters, counter-terrorism, and contingencies in support of South Korea, Japan, the Philippines, Taiwan, or elsewhere in Asia. But the defense buildup on Guam is moderate. China has concerns about the defense buildup. Guam's role has increased with plans to withdraw some U.S. forces from Japan and South Korea. This report describes in brief detail the various cooperative efforts, including financial efforts, undertaken by the U.S. and the above nations.