A Marine with 2nd Marine Logistics Group fires an M240B medium machine gun during a live-fire exercise portion of the Battle Skills Training School machine gunner course aboard Camp Lejeune, N.C., Oct. 4, 2013. Marines going through the course attended daily classes about proper machine gun use and ran the endurance course, a 3.4-mile obstacle course, prior to firing the weapons at the end of the two-week course.