U.S. Air Force Staff Sgt. Tyler Simkins, 633rd Civil Engineer Squadron Prime Base Emergency Engineer Force (BEEF) noncommissioned officer, maps out his group’s next marker during land navigation training at Fort Eustis, Va., Oct. 16, 2013. About 40 Prime Beef Airmen participated in the training. (U.S. Air Force photo by Airman 1st Class Austin Harvill/Released)