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 (0.185261 MB) Tags: Week In Photos, Week In Photos Credit: VIRIN: 728778-C-LJS22-516.jpg Photo Gallery