In remote warfare, it seems hardly significant that machines kill people: what matters is that they kill "humanely." This book presents the serious ethical, psychological, and legal questions posed by the weaponry of armed drones. "A nice target! I want to try to hit right in the middle from behind." This is not a sniper speaking from the roof of a building, but someone comfortably leaning back in his chair at Creech Air Force Base, Nevada. He is controlling a drone that is preparing to fire a Hellfire missile at a group of suspects in Afghanistan. With this new marvel of military technology, thousands of kilometers lie between the trigger where the finger rests and the tube from which the projectile emerges. This distance disrupts our conception of war: what is a fighter without a fight? Where is the battlefield?.