BARRELING THROUGH U.S. Air Force Airman 1st Class Phillip Baiao moves a barrel across an improvised bridge during a training exercise on Camp Rapid, Rapid City, S.D., June 9, 2008. The exercise tests the ability of engineering and support units to mobilize equipment, deploy to a battle zone, coordinate combat and service support missions, and re-deploy home. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 698383-E-LCZ75-661.jpg Photo Gallery