"Isolated, behind enemy lines or far out in front of advancing friendly armies, a combat controller might be tasked with coordinating an air strike on an enemy air-defense position. Equipped with special range-finding binoculars, a palm-top computer, a GPS (global positioning system) receiver, and a rifle, the airmen can clandestinely spot the target, direct an attacking pilot to it, and then leap on a motorcycle and race toward another target where he will repeat the process."