170201-N-DH124-122 PORT HUENEME, Calif. (Feb. 1, 2017) Hospital Corpsman 1st Class William Reece, assigned to Naval Mobile Construction Battalion (NMCB) 4, treats a simulated casualty during a mass casualty drill in support of Command Post Exercise (CPX) 3. The intent of CPX-3 is to establish command, control, communication, computer and intelligence infrastructure to prepare for the battalion's upcoming field training exercise (FTX). (U.S. Navy photo by Mass Communication Specialist 1st Class Rosalie Chang/Released)