170514-N-DH124-655 FORT HUNTER LIGGETT, Calif. (May 14, 2017) Hospital Corpsman 3rd Class Andy Diep, assigned to Naval Mobile Construction Battalion (NMCB) 4, checks the pulse of a simulated casualty during the battalion's field training exercise. The training is designed to exercise all aspects of the battalion’s defensive and operational capabilities from manning a fighting position on the company lines to reacting to chemical warfare threats and improvised explosive devices. (U.S. Navy photo by Mass Communication Specialist 1st Class Rosalie Chang/Released)