Spent shell casings pile up next to a Army combat engineer who is manning an M240-B machine gun during a live-fire exercise on Fort Bragg, N.C., July 21, 2011. Machine gunners provided covering fire while other engineers breached a wire obstacle nearby. Spent shell casings pile up next to a Army combat engineer who is manning an M240-B machine gun during a live-fire exercise on Fort Bragg, N.C., July 21, 2011. Machine gunners provided covering fire while other engineers breached a wire obstacle nearby. SHARE: Download: Full Size (1.5 MB) Tags: Photo Essays Credit: VIRIN: 151902-P-AHN62-056.jpg Photo Gallery