U.S. Navy Builder 3rd Class Ryan Keeton, with Naval Mobile Construction Battalion 1, digs a trench to drain water from his fighting position Sept. 24, 2013, during Operation Bearing Duel 2013 in Hattiesburg, Miss. Operation Bearing Duel is a naval mobile construction battalion field training exercise designed to prepare Seabees to deploy and conduct operations in a contingency environment. (U.S. Navy photo by Chief Mass Communication Specialist Kim Martinez/Released)