Since the 1960s, U.S. political leaders have engaged in a controversial debate regarding the deployment of a strategic ballistic missile defense (BMD) system to protect the American homeland. Using an analytic framework consisting of prerequisites for successful strategic weapon programs, this book assesses BMD proposals from the Cold War era (focusing primarily on the 1967 Sentinel proposal). The book develops a consensus-building approach to future strategic BMD policies that is based on lessons learned from Cold War proposals, recent congressional initiatives, and developments in the international security environment. To protect the American people from emerging rogue state threats and potential accidental or unauthorized launches from China and Russia, the United States should deploy a limited strategic BMD system comprising multiple ground-based interceptor sites supported by space-based missile tracking sensors. The study includes a comprehensive arms control proposal aimed at working with Russia and other strategic powers to continue the reduction of Cold War offensive arsenals while deploying limited defenses. Pursuit of the Shield presents a new strategic agenda for a new era, one that will reinforce world peace and security. With a foreword by Senator John Warner, Chairman of the Senate Armed Services Committee.