** FILE ** Bulgarian soldiers prepare to board an aircraft at Krumovo airfield, some 150 kilometers (93 miles) east of Sofia, in this Aug. 11, 2003 file photo. Bulgaria and Ukraine, two of America's allies in Iraq are withdrawing their forces this month and a half-dozen others are debating possible pullouts or reductions, increasing pressure on Washington as calls mount to bring U.S. troops home. (AP Photo/File)