Senior Airman Jacob Membreno, 8th Civil Engineer Squadron, acts as Crater Chief during a combined USAF/Republic of Korean Air Forces airfield management training at Kunsan Air Base, Republic of Korea, October 21, 2008. The Crater Chief coordinates all of the assets necessary to complete the job of filling in a crater on the airfield. (U.S. Air Force photo/Staff Sgt. Jason Colbert)