170516-N-DH124-623 FORT HUNTER LIGGETT, Calif. (May 16, 2017) Builder Constructionman Heith Wright, assigned to Naval Mobile Construction Battalion (NMCB) 4, uses a jackhammer to break cement around a crater to repair the damage from a simulated airstrike during the battalions’ field training exercise (FTX). NMCB-4 is conducting their final graded FTX, testing the battalion’s command, control and communication functions through a variety of simulated real-life scenarios encountered during deployments. (U.S. Navy photo by Mass Communication Specialist 1st Class Rosalie Chang/Released)