WASHINGTON - Senate Democrats on Wednesday called for an investigation into allegations that Halliburton Co. served food that had passed its expiration date by as much as a year to U.S. troops in Iraq Rory Mayberry, a former food production manager for Halliburton subsidiary KBR, told lawmakers last month that when outdated food arrived, "we were told by KBR food service mangers to use these items anyway." He also said food packages damaged in insurgent attacks were still used "after removing the bullets and any shrapnel from the bad food that was hit." In a letter to Defense Secretary Donald...