190625-N-OX025-5300 ROI-NAMUR ATOLL, Marshall Islands (June 25, 2019) Builder 3rd Class Erin McMillan, assigned to Naval Mobile Construction Battalion (NMCB) 4, pours concrete for a roof beam which will support joists, trusses and other roofing elements. NMCB-4 is forward-deployed throughout the Indo-Pacific region ready to support major combat operations, humanitarian assistance and disaster relief and to provide general engineering and civil support to U.S. and joint forces. (U.S. Navy photo by Utilitiesman 3rd Class Ervin Villanueva/Released)