Kevin Holman directs Elias Davila, both civilian contractors with the 28th Civil Engineer Squadron, while they unload concrete barriers during the Operational Readiness Exercise on Ellsworth Air Force Base, S.D., Dec. 6, 2011. The ORE challenges the ability of Airmen to operate effectively in a wartime environment. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)