The war on terror is remaking conventional warfare. The protracted battle against a non-state organization, the demise of the confinement of hostilities to an identifiable battlefield, the extensive involvement of civilian combatants, and the development of new and more precise military technologies have all conspired to require a rethinking of the law and morality of war. Just war theory, as traditionally articulated, seems ill-suited to justify many of the practices of the war on terror. The raid against Osama Bin Laden's Pakistani compound was the highest profile example of this strategy, but the issues raised by this technique cast a far broader net: every week the U.S. military and CIA launch remotely piloted drones to track suspected terrorists in hopes of launching a missile strike against them. In addition to the public condemnation that these attacks have generated in some countries, the legal and moral basis for the use of this technique is problematic. Is the U.S. government correct that nations attacked by terrorists have the right to respond in self-defense by targeting specific terrorists for summary killing? Is there a limit to who can legitimately be placed on the list? There is also widespread disagreement about whether suspected terrorists should be considered combatants subject to the risk of lawful killing under the laws of war or civilians protected by international humanitarian law. Complicating the moral and legal calculus is the fact that innocent bystanders are often killed or injured in these attacks. This book addresses these issues. Featuring chapters by an unrivalled set of experts, it discusses all aspects of targeted killing, making it unmissable reading for anyone interested in the implications of this practice.