171214-N-GZ832-0783 OKINAWA, Japan (Dec. 14, 2017) Hospital Corpsman 2nd Class Hanna Battles (left) performs triage on Equipment Operator Constructionman Rene Trejobarrera, both assigned to Naval Mobile Construction Battalion (NMCB) 4, during a mass casualty exercise. NMCB 4 is forward deployed to the pacific, ready to support major combat operations, humanitarian assistance/disaster relief operations, and provide general engineering support to Navy, Marine Corps, and joint operational forces. (U.S. Navy photo by Mass Communication Specialist 2nd Class Benjamin Stevens/Released)