141007-N-SD120-001 FORT HUNTER LIGGETT, Calif. (October 07, 2014) Construction Mechanic 2nd Class Chris Harris instructs other Seabees on how to operate the MK-19 automatic grenade launcher at Naval Mobile Construction Battalion (NMCB) 5�s operating base on Fort Hunter Liggett, during the battalion�s field training exercise (FTX). Using realistic scenarios in a field environment, NMCB 5 is being evaluated by Naval Construction Group (NCG) 1 on the final FTX in preparation for a deployment. The exercise challenges the battalion's command and control functions while maintaining the camp, building structures and bridges, and defending the camp and construction projects. Seabee battalions perform contingency construction, humanitarian aid, and disaster recovery assistance. (U.S. Navy Photo by Mass Communication Specialist 1st Class John P. Curtis/Released)