Airman 1st Class Roger Hild, U.S. Air Force, guides the upper portion of an add-on armor kit as it is lowered onto the cab section of an M931 truck tractor at Balad Air Base, Iraq, on Jan. 13, 2006. The add-on armor kit provides the driver and gunner added protection against weapons fire and improvised explosive devices. Hild is deployed to the 732nd Expeditionary Logistics Squadron at Balad Air Base.