170111-N-CS953-086 ARABIAN SEA (Jan. 11, 2017) The Arleigh Burke-class guided-missile destroyer USS Mahan (DDG 72) fires its Mark 45 5-inch gun during a pre-action calibration firing. Mahan is deployed in the U.S. 5th Fleet area of operations in support of maritime security and theater security operation efforts. (U.S. Navy photo by Mass Communication Specialist 1st Class Tim Comerford/Released)