Weapon: In the Mojave Desert, troops test computers, unmanned drones and other equipment that could transform warfare. FORT IRWIN, Calif. -- It was not long ago that Army Col. Abe Turner would look to a rumpled paper map and a hand-held FM radio to get a fix on an enemy's location. Now he looks to his laptop computer, where the enemy glides across the screen, red icons on a glowing green relief map, updated every few minutes. "The system we have now is so much better at painting a picture of what is out there," said Turner, an assistant operations...