171016-N-NO181-049 BUSAN, Republic of Korea (Oct. 15, 2017) Builder 3rd Class Matthew Hanlin, assigned to Naval Mobile Construction Battalion (NMCB) 4, operates a compaction roller to create a solid foundation on which concrete can be poured. The completed project includes a gazebo and deck area for the Morale; Welfare and Recreation (MWR) Clubhouse facility. (U.S. Navy photo by Steelworker 1st Class Ray Crumity/Released)