Tank crew members (from left) Staff Sgt. Barron VanMeurs, Pfc. Michael Oakes and Pvt. Jason Malcom, all from the Nevada National Guard, survey enemy positions during maneuvers at Fort Irwin, Calif., Saturday. (PVT photo by Mark Waite) From the Tactical Operations Center in a tent atop a hill, staff Sgt. John Watt, from Pahrump, keeps track of tank movements on a grid map. (PVT photo by Mark Waite) PV guardsman becomes 'enemy' as U.S. prepares for war with Iraq" FORT IRWIN, Calif. - Staff Sgt. John Watt of Pahrump listened intently to the radio transmission. "Bravo Element straightline Starling...