U.S. Air Force Airmen assigned to the 732nd Expeditionary Logistics Squadron lower the upper portion of an add-on armor (AOA) kit onto the lower cab section of an M931 truck tractor at Balad Air Base, Iraq, Jan. 13, 2006. The AOA kit provides the driver and gunner added protection against weapons fire and improvised explosive devices. DoD photo by Master Sgt. Lance Cheung, U.S. Air Force. (Released)
Big version at JCCC.