Sgt. Jeremy Toteno (center), a field artillery cannoneer

Sgt. Jeremy Toteno (center), a field artillery cannoneer with Golf Battery, 10th Marine Regiment, 2nd Marine Division teaches Marines and sailors assigned to 2nd Maintenance Battalion, Combat Logistics Regiment 25, 2nd Marine Logistics Group firing procedures of an M777 howitzer during Rolling Thunder, a biannual training exercise at Fort Bragg, N.C., May 9, 2014. Rolling Thunder is a three-week exercise focused on artillery support operations and logistics to improve the combat readiness of II Marine Expeditionary Force, based out of Camp Lejeune, N.C.