171023-N-KT595-374 PACIFIC OCEAN (Oct. 23, 2017) The guided-missile cruiser USS Mobile Bay (CG 53) fires a 5-inch/54-caliber Mark 45 lightweight gun at a simulated target during a live-fire exercise. Mobile Bay is currently underway testing the updated AEGIS Baseline 9 weapons system in preparation for its upcoming deployment. (U.S Navy photo by Mass Communication Specialist 1st Class Chad M. Butler/Released)