U.S. Marines with Echo Battery, 2nd Battalion, 10th Marines, 2d Marine Division, fire an M107 high explosive round from an M777 howitzer during Operation Rolling Thunder aboard Ft. Bragg, N.C., Oct. 15, 2013. The operation was conducted to test and improve 10th Marine's ability to perform during a field exercise. (U.S. Marine Corps photo by Sgt. Andrew D. Young/Released)