Actually, there is no "call" to be made. A Predator pilot in a dark room in Nevada is flying his UAV and identifies a terrorist. He reports it and requests permission to make the kill. Some low ranking officer says, "He meets the criteria. Permission granted. Fire at will." The pilot lines up the shot and pushes a button. A few seconds later, the terrorist is vaporized and we are a little safer. There is no legal or constitutional issue involved. The terrorist is an enemy combatant trying to kill Americans. Our military kills him, exactly like all other wars in all other times and places; only the technology is different. Is this really different from a soldier killing an enemy with a bronze sword? No. Did we fire-bomb Dresden? Hmm?