140331-N-RB546-165 CAMP SHELBY, Miss. (Mar. 31, 2014) – Builder 3rd Class Adam Longstreth and Builder 3rd Class David Goebel with the Large Detachment of Naval Mobile Construction Battalion (NMCB) 133 prepare to nail plywood on the roof of a timber bunker during field exercise Bearing Duel 01-14. Bearing Duel 01-14 allows Naval Construction Group (NCG) 2 the opportunity to certify NMCB 133 as they maintain overall readiness by honing tactical and professional skills. (U.S. Navy photo by Mass Communication Specialist 2nd Class Anthony R. Martinez/Released)