Senior Master Sgt. Victor Block connects a strap to a T barrier. U.S. Air Force Senior Master Sgt. Victor Block from the 407th Expeditionary Civil Engineer Squadron connects a strap to a T barrier in preparation to lift it onto a trailer bed at Ali Base, Iraq, on Dec. 1, 2008. Airmen from the squadron are disassembling Alaskan shelters, sandbags and barrier walls in preparation for phase four of a trailer buildup. SHARE: Download: Full Size (0.03 MB) Credit: VIRIN: 271760-F-TBC99-020.jpg Photo Gallery