U.S. Air Force Airmen from the 633rd Civil Engineer Squadron Prime Base Emergency Engineer Force (BEEF) discover a marker during land navigation training at Fort Eustis, Va., Oct. 16, 2013. In addition to land navigation areas, Fort Eustis offers beachheads, cargo loading zones and numerous specialized ranges and buildings for training. (U.S. Air Force photo by Airman 1st Class Austin Harvill/Released)