Shift in the International Security Environment: Potential Implications for Defense-Issues for Congress [September 15, 2017] [open pdf - 757KB]
"World events have led some observers, starting in late 2013, to conclude that the international security environment has undergone a shift from the familiar post-Cold War era of the past 20 to 25 years, also sometimes known as the unipolar moment (with the United States as the unipolar power), to a new and different situation that features, among other things, renewed great power competition with China and Russia and challenges by these two countries and others to elements of the U.S.-led international order that has operated since World War II. [...] The issue for Congress is whether to conduct a broad reassessment of U.S. defense analogous to the 1993 BUR, and more generally, how U.S. defense funding levels, strategy, plans, and programs should respond to changes in the international security environment. Congress's decisions on these issues could have significant implications for U.S. defense capabilities and funding requirements."
CRS Report for Congress, R43838
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html