U.S. Navy Aviation Ordnanceman 3rd Class Darien Phelps, top right, instructs Ship's Serviceman 2nd Class Jiong Liu as he fires an M240 machine gun during a crew-served weapons gun shoot aboard the amphibious assault ship USS Peleliu in the South China Sea Oct. 9, 2014, while underway to participate in Amphibious Landing Exercise 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.