U.S. Navy Builder 3rd William Bell, with Naval Mobile Construction Battalion 1, builds a stairwell for a lookout point Sept. 28, 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)