"Since 2000, the U.S. military has been building up forward-deployed 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. The defense buildup on Guam has been moderate. Nonetheless, China has concerns about the defense buildup, suspecting it to be directed against China. Guam's role has increased with plans to withdraw some U.S. forces from Japan and South Korea. In 2006, the United States and Japan agreed on a 'Roadmap' to strengthen their alliance, including a buildup on Guam to cost $10.3 billion, with Japan contributing 60%. The goals are to start the related construction on Guam by 2010 and to complete relocation of 8,000 marines and their 9,000 dependents from Okinawa to Guam by 2014."
CRS Report for Congress, RS22570
U.S. Dept. of State, Foreign Press Centers: http://www.fpc.state.gov/