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.

This report discusses the United States' Department of Defense's (DOD) Japan 2011 Earthquake relief efforts, designated "Operation Tomodachi," which is Japanese for "friend." The report includes an overview of the situation, funding for DOD efforts, naval activities, air activities, and a historical overview of U.S. military presence in Japan.

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Since the mid-1990s, tensions have spiked periodically among Japan, China, and Taiwan over the disputed Senkaku (Diaoyu/Diaoyutai) islets in the East China Sea. Each time tensions erupt over the islets, questions have arisen concerning the U.S. relationship to the islets. This report focuses on that issue.