171228-N-BK384-027 INDIAN OCEAN (Dec. 28, 2017) The San Antonio-class amphibious transport dock ship USS San Diego (LPD 22) fires the aft MK-46 30mm gun during a live-fire exercise. San Diego, part of the America Amphibious Ready Group, with embarked 15th MEU, is operating in the Indo-Asia Pacific region to strengthen partnerships and serve as a ready-response force for any type of contingency. (U.S. Navy photo by Mass Communication Specialist 3rd Class Justin A. Schoenberger/Released)