U.S. Navy Aviation Ordnanceman 3rd Class Tanner Barnes fires a Mark 38 25 mm machine gun during a crew-served weapons gun shoot aboard the amphibious assault ship USS Peleliu (LHA 5) in the South China Sea Oct. 9, 2014, while underway to participate in Amphibious Landing Exercise (PHIBLEX) 15. PHIBLEX is a bilateral training exercise designed to improve the interoperability, readiness and professional relationships between the U.S. Marine Corps and partner nations. (U.S. Navy photo by Mass Communication Specialist 3rd Class Dustin Knight/Released)