U.S. Ground Forces in the Indo-Pacific: Background and Issues for Congress [May 6, 2022] [open pdf - 2MB]
From the Summary: "Since the end of the Second World War in 1945, the U.S. military has maintained a significant and enduring presence in the Indo-Pacific region. In the past, the United States' strategic approach to the region has varied greatly. From September 11, 2001, until almost the next decade, strategic emphasis was placed largely on global counterterrorism, primarily focused on U.S. Central Command's (USCENTCOM's) and later U.S. Africa Command's (USAFRICOM's) areas of operation. Starting around 2004, the George W. Bush Administration began to consider strengthening relations with allies in Asia and potentially revising U.S. doctrine and force posture in the region to improve U.S. capabilities. In 2011, the Obama Administration announced the United States would expand and strengthen its existing role in the Asia-Pacific region. Referred to as the 'Rebalance to Asia,' this strategic shift away from counterterrorism was intended to devote more effort to influencing the development of the Asia-Pacific's norms and rules, particularly as China was emerging as an ever-more influential regional power. [...] The February 2022 Russian invasion of Ukraine and its present and future implications for European and Indo-Pacific security will likely increase both congressional interest and action in the near term and for the foreseeable future. Potential issues for Congress include  the role of U.S. ground forces in the Indo-Pacific region,  the posture of U.S. ground forces in the Indo-Pacific region,  U.S. ground forces execution of regional wartime missions, and  the potential impact of the Ukrainian conflict on U.S. ground forces in the Indo-Pacific region."
CRS Report for Congress, R47096
Congressional Research Service: https://crsreports.congress.gov/