(FILE) This US Navy photo obtained October 7, 2019 shows the aircraft carrier USS Ronald Reagan (CVN 76)(L), and the amphibious assault ship USS Boxer (LHD 6) and ships from the Ronald Reagan Carrier Strike Group and the Boxer Amphibious Ready Group underway in formation while conducting security and stability operations in the US 7th Fleet area of operations on October 6, 2019 in the South China Sea. US 7th Fleet is the largest numbered fleet in the world, and the US Navy has operated in the Indo-Pacific region for more than 70 years, providing credible, ready forces to help preserve peace and prevent conflict. (Photo by Erwin Jacob V. MICIANO / Navy Office of Information / AFP) (NAVY OFFICE OF INFORMATION/ERWIN JACOB V MICIANO VIA AFP)