PACIFIC OCEAN (Feb. 12, 2012) The MK 45 5-inch gun is fired aboard the guided-missile destroyer USS Pinckney (DDG 91) during a sea power demonstration. Pinckney is a part of the John C. Stennis Carrier Strike Group and is operating in the US 7th Fleet area of responsibility conducting maritime security operations. (US Navy photo by Mass Communication Specialist 2nd Class Eddie Harrison/Released)

[Image courtesy of the US Navy Website.]