How do you tell anyone? Drones can fly lower and slower, and make more passes, than a manned aircraft because there is no risk to our people. Would you prefer to have your neighbor's house targeted by a Hellfire missile fired from a drone at 10,000 ft by an operator in Kansas viewing the house through a telephoto lens and requesting clearance to fire from another military officer not in harm's way, or by a Maverick missile fired from a Warthog at 15,000 ft by a pilot who has only the Maverick's optics to see by and who must keep a constant watch for missile trails coming to kill him?
You obviously want this done by troops on the ground. Now, I agree completely with Kage that the point of military action should not be a fair fight, but the very opposite. But setting that aside, no poorly armed terrorist force is going to adopt that kind of fair fight. You'd have civilians killed by massive explosions triggered to kill the American "cops", civilians killed because American soldiers interpreted their actions as going for a weapon or trigger, civilians killed while running because American soldiers are scary or they have something else to hide, in addition to the American soldiers and Marines killed attempting to be cops in hostile lands and worse, those taken captive and tortured to death. You'd likely have large scale warfare between American troops and those in Pakistan, Yemen, etc. since they could hardly avoid reacting to that kind of invasion.

Thanks. Now get off my lawn you damned kids!