Keywords: 131208-N-PW661-032 (11360513693).jpg The forward Mark 45 5-inch gun aboard the guided missile destroyer USS Mason DDG 87 fires during a live-fire exercise in the Gulf of Oman Dec 8 2013 The Mason was part of the Harry S Truman Carrier Strike Group and was underway in the U S 5th Fleet area of responsibility supporting maritime security operations and theater security cooperation efforts DoD photo by Mass Communication Specialist 2nd Class Rob Aylward U S Navy/Released https //www flickr com/photos/39955793 N07/11360513693/ 131208-N-PW661-032 2013-12-08 05 55 https //www flickr com/people/39955793 N07 U S Department of Defense Current Photos PD-USGov U S Department of Defense Current Photos https //flickr com/photos/39955793 N07/11360513693 2016-09-03 07 32 16 United States Government Work Gulf of Oman United States Department of Defense |