WELDER WORK U.S. Air Force Airman 1st Class Robert Campbell Jr. uses a welder to modify a K-span arch for the new mine-resistant, ambush-protected armored vehicle rollover trainer on Ali Base, Iraq, Aug. 27, 2009. Campbell is assigned to the 557th Expeditionary Squadron. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 869140-S-ACW69-054.jpg Photo Gallery