A member of Detachment 4 from Naval Mobile Construction Battalion (NMCB) 25 dons a gas mask for a Chemical, Biological and Radiological (CBR) threat training scenario during field training exercise Bearing Duel 01-14. Bearing Duel 01-14 allows Naval Construction Group (NCG) 2 to evaluate NMCB 25 in tactical and professional skills prior to their upcoming deployment to Afghanistan. (U.S. Navy photo by Mass Communication Specialist 2nd Class Anthony R. Martinez/Released)