171118-N-GZ832-0017 OKINAWA, Japan (Nov. 18, 2017) Seabees assigned to Naval Mobile Construction Battalion (NMCB) 4, work on a range card for the 50 cal. machine gun. Each person on a fire team learns the details of a range card and knows the responsibilities of that firing position. NMCB’s are 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 Communications Specialist 2nd Class Benjamin Stevens/Released)