A Mark 15 Phalanx close-in weapons system aboard the guided missile cruiser USS Gettysburg (CG 64) fires during a live-fire exercise in the Gulf of Oman Nov. 1, 2013. The Gettysburg 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.