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PrefaceResearch done at the RAND Corporation and elsewhere over the past several years has identified some serious shortcomings in the ability of programmed U.S. forces to meet emerging challenges. Prominent among these challenges are those posed by the growth of advanced anti-access/area denial threats in the arsenals of U.S. adversaries, Russia's use of military power against neighboring European states, North Korea's development of nuclear weapons, and the spread of violent Salafist-jihadi ideology with the emergence of the quasi-state Islamic State in Iraq and Syria (ISIS). Individually, each of these developments places stress on U.S. and allied military capabilities. Collectively, they represent the major elements of an international security environment that is more complex and more dangerous than that to which Americans have been accustomed since the end of the Cold War.These developments should be important factors in the Trump administration's review of National Defense Strategy. They should also prompt a reconsideration of the Budget Control Act of 2011, which became law before some of these threats became manifest. Clearly, the Trump administration will need to reassess the nation's defense strategy, posture, and program with an eye toward finding a better balance than exists today between the ambitions embodied in the strategy and the resources devoted to it. This report is offered as a contribution to that effort.This report should be of interest to defense policymakers, practitioners in the executive and legislative branches, analysts, the media, experts in nongovernmental organizations, and those concerned with defense planning and the role of the United States in international security affairs.Thi...