Moral Responsibility in Twenty-First-Century Warfare explores the complex relationship between just war theory and the ethics of autonomous weapons systems (AWS). One of the challenges facing ethicists of war, particularly just war theorists, is that AWS is an applicative concept that seems, in many ways, to lie beyond the human(ist) scope of the just war theory tradition. The book examines the various ethical gaps between just war theory and the legal and moral status of AWS, addresses the limits of both traditional and revisionist just war theory, and proposes ways of bridging some of these gaps. It adopts a dualistic notion of moral responsibility-or differing, related notions of moral responsibility and legitimate authority-to study the conflicts and contradictions of legitimizing the autonomous weapons that are designed to secure peace and neutralize the effects of violence. Focusing on the changing conditions and dynamics of accountability, responsibility, autonomy, and rights in twenty-first-century warfare, the volume sheds light on the effects of violence and the future ethics of modern warfare.