Offers a conceptual pathway for U.S. policymakers to begin recalibrating America's security role to reverse what has appeared to be a widening gap between U.S. ends and means, now and in the future. Provides an overview of eight broad trends shaping the international security environment; a global analysis of the world's seven regions, to consider important developments in their distinctive neighborhoods; and, an examination of prospective U.S. contributions, military capabilities and force structure, national security organization, alliances and partnerships, and strategies.