Steven A. Pomeroy has authored the first history of the American mobile intercontinental ballistic missile (ICBM), a technology the United States spent four decades and billions of dollars creating but never deployed. An Untaken Road showcases how the evolution of a technology that ultimately never existed and the politics that surrounded it end up significantly shaping American nuclear strategy and forces for decades. Utilizing recently declassified documents, years of experience, and an unrivaled passion for the history of military technologies, Pomeroy has created a new framework on the nature of strategic weapons technology innovation. This thorough study of a “road not taken” is a must read for those seeking to understand the challenges and constraints on U.S. military weapon programs, especially when inter-organization competition, domestic politics, strategic needs, and new technologies collide.