From Newsweek Magazine:"The whole art of war consists of getting at what is on the other side of the hill," said the Duke of Wellington, conqueror of Napoleon at Waterloo. In the murky kind of fight that marks modern warfare against terrorists and guerrillas, knowing what's on the other side of the hill—or inside a building—takes on a whole new urgency and meaning. Lt. Col. Scott Williams, who leads a unit of Apache helicopters in Baghdad, is in the business of "servicing" targets, by which he means anything from blowing up a building with a Hellfire missile to helping local police make arrests. He must know when to shoot—and when not to.
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Update: Graphic: How Military Drones Work
My Comment: When I first heard of the Predator, I knew immediately that this was going to change warfare completely. Able to work at any time of the day, using infra-red at night. Silent and deadly with its Hellfire missiles. The ability to silently pick-out its enemy or observe what they are doing, and done from a command post thousands of miles away .... this changes military doctrine completely. One cannot help but think that when the next generation for these weapons come online, this will be an even more effective weapon in any conflict.