This volume is a systematic critical survey of American strategic thinking and the strategic culture in which it is formed. In particular it seeks to interrogate the theory and strategy of nuclear deterrence, and its relationship to the concept of missile defence. Drawing widely on the theoretical literature in international relations and strategic studies, it identifies the key groups that have competed over America's nuclear policy post-1945 and examines how the concept of missile defence went through a process of gestation and intellectual contestation, leading to its eventual legitimization in the late 1990s. Steff sheds light on the individuals, groups, institutions and processes that led to the decision by the Bush administration to deploy a national missile defence shield.