Supported by genuine historical cases, this book argues that certain new technologies in warfare can not only be justified within the current framework of the just war theory, but that their use is mandatory from a moral perspective. Technological developments raise questions about the manner in which wars ought to be fought. The growing use of drones, capacity-increasing technologies, and cyberattacks are perceived by many as posing great challenges to Just War Theory. Instead of seeing these technologies as inherently unethical, this book adopts a different perspective by arguing that they are morally necessary since they can limit the potential violations of the moral rules of war and ensure that militaries better respect their obligation to protect their members. Caron’s research offers insights into how and under what conditions autonomous or semi-autonomous robots, artificial intelligence, cyberwarfare, and capacityincreasing technologies can be considered as legitimate weapons. This book will be of interest to students, members of the armed forces, and scholars studying Politics, International Relations, Security Studies, Ethics, and Just War Theory.