170519-N-WZ681-094 WATERS SOUTH OF JAPAN (May 19, 2017) Gunner's Mate 3rd Class Joseph Decastro fires a Mark 38 25 mm machine gun on the fantail of the aircraft carrier USS Ronald Reagan (CVN 76). Ronald Reagan is the flagship of Carrier Strike Group 5, providing a combat-ready force that protects and defends the collective maritime interests of its allies and partners in the Indo-Asia-Pacific region. (U.S. Navy photo by Mass Communication Specialist Seaman Apprentice Randy Lee Adams II/Released)