Keywords: US Navy 111206-N-FI736-139 The Mk-45 5-inch-54 caliber lightweight gun aboard the Arleigh Burke class guided-missile destroyer USS Porter (DDG 78).jpg en ATLANTIC OCEAN Dec 6 2011 The Mk-45 5-inch/54 caliber lightweight gun aboard the Arleigh Burke class guided-missile destroyer USS Porter DDG 78 is fired during a live-fire exercise Porter is underway preparing for an upcoming deployment with the Enterprise Carrier Strike Group U S Navy photo by Mass Communication Specialist 3rd Class Scott Pittman/Released 2011-12-06 111206-N-FI736-139 Navy http //www navy mil/view_image asp id 111596 U S Navy photo by Mass Communication Specialist 3rd Class Scott Pittman PD-USGov-Military-Navy Aboard USS Porter DDG-78 5 /54 caliber Mark 45 gun firing |