Seabees assigned to Naval Mobile Construction Battalion (NMCB) 133 build a heavy timber bunker during a field training exercise.

CAMP SHELBY, Miss. (Jan. 21, 2011) Seabees assigned to Naval Mobile Construction Battalion (NMCB) 133 build a heavy timber bunker during a field training exercise. The assembly and disassembly of the bridge was one of many construction projects completed during the exercise, where the battalion trained and was evaluated on defensive operations and completion of construction projects in a tactical environment. (U.S. Navy photo by Chief Mass Communication Specialist Ryan C. Delcore) File# 110125-N-8816D-018