Petty Officer 1st Class Frederick Karpinski, a boatswain's mate from the Coast Guard Cutter Alder, and Petty Officer 2nd Class David Duenow, a boatswain's mate from Coast Guard Station Duluth in Minn., mount an M240B machine gun aboard the Coast Guard Cutter Beluga, an 87-foot patrol boat homeported in Little Creek, Va. during a gunnery exercise in the Atlantic Ocean at the Dam Neck firing range, Tuesday, July 31, 2012. Approximately 20 crewmembers shot during a gunnery exercise to either acquire or renew their weapons competancy, which must be done every six months. U.S. Coast Guard photo by Petty Officer 1st Class Brandyn Hill