SHEER CONCENTRATION U.S. Navy Petty Officer 3rd Class Kyle Fouts, assigned to the weapon's department aboard the USS Abraham Lincoln, sights a .50-caliber machine gun on a floating drum target during a "killer barrel" exercise, Jan. 19, 2008. SHARE: Download: Full Size (0.02 MB) Credit: VIRIN: 536307-W-EWQ43-669.jpg Photo Gallery