On February 1, 2010, the Defense Department released a report on the 2010 Quadrennial Defense Review, a legislatively mandated assessment of defence strategy, force structure, weapons programs, and operations designed to guide defence programming, operational planning, and budgets projected as far as twenty years ahead. This book provides an overview of the Quadrennial Defense Review, with a view toward addressing the context of the ongoing evolution of defence policy and identifying issues for future reviews on national security strategies.