Builder 3rd Class David Jaillet from Detachment 1 of Naval Mobile Construction Battalion (NMCB) 133 joins together supporting beams for the frame of a timber bunker during the battalion's field exercise. The training helps NMCB 133 hone tactical and professional skills and maintains the battalion's overall readiness. (U.S. Navy Photo by Mass Communication Specialist 2nd Class Mark A. Martinez/RELEASED)