180116-N-FT956-2387 DIEGO GARCIA, British Indian Ocean Territory (Jan. 16, 2018) Commanding Officer of Naval Mobile Construction Battalion 4, Cmdr. James Cho, left, receives a brief from Builder 3rd Class Veronica Prado on how the Central Tool Room (CTR) is organized and maintained. 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 Builder 2nd Class Christopher J. Moore/Released)