U.S. Air Force Airmen assigned to the 633rd Civil Engineer Squadron practice land navigation during Prime Base Engineer Emergency Force training at Joint Base Langley-Eustis, Virginia, July 19, 2018. Prime BEEF Airmen may be called upon to perform a variety of duties, including airbase site surveys, establishing bare base camps and operations and utility system installation. (U.S. Air Force photo by Staff Sgt. Areca T. Bell)
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