National Guard at War at Home to Prepare for Real Thing in Iraq One day last week, Capt. Vincent J. Heintz and his men were trying to quell an unruly demonstration by a group of Iraqi villagers when a lone suicide bomber rushed the crowd. A blast rang out, and the scene dissolved into a chaos of smoke and angry Arabic voices. But not for long. Within minutes, the soldiers were dusting the snow off their uniforms and bantering with the villagers, actually Iraqi-Americans flown in to Fort Drum, N.Y., from Michigan. Everyone filed into a nearby warehouse, sat down...