<hi style=afpcap>The US Air Force never sleeps. In fact, most Pentagon warfighting plans call for starting any combat action in the nocturnal hours. The setting sun may mark the approach of day's end for these Fairchild A-10 Thunderbolt II fighter-bombers, those erstwhile tank-killers better known as "Warthogs," but after they touch down, other aircraft will take off in darkness ready to fly and fight.</hi>