The US Navy's John C Stennis Strike Group (JCSSG), which is the centre piece of the Great Green fleet, has conducted routine operations in the South China Sea.
The strike group comprised of Nimitz-class aircraft carrier USS John C Stennis (CVN 74), USS Chung-Hoon (DDG 93), USS Stockdale (DDG 106) and USS Mobile Bay (CG 53) were stationed in the eastern half of the sea for four days after transiting through the Luzon Strait.
The vessels performed a replenishment-at-sea exercise, which involved receiving advanced biofuel, aviation fuel and supplies from the supply-class fast combat support ship, USNS Rainier (T-AOE 7).
The exercise also involved flight operations from the Carrier Airwing (CVW) 9.
Vessels from China's People's Liberation Army Navy trailed at a close vicinity to the US ships during the exercise.
US Navy Commanding Officer captain Greg Huffman said: "We have Chinese ships around us that we normally didn't see in my past experience.
"Everything I have heard over bridge-to-bridge channels has been good communications between professional mariners."
Recently, the exercise was also performed by a series of US Navy ships in the 7th Fleet area of operations including the Arleigh Burke-class guided-missile destroyers USS Curtis Wilbur (DDG 54), USS Lassen (DDG 82), USS Preble (DDG 88) and USS McCampbell (DDG 85), the multi-purpose amphibious assault ship USS Essex (LHD 2), the amphibious dock landing ship USS Ashland (LSD 48), the Ticonderoga-class guided-missile cruiser USS Chancellorsville (CG 62), and the Freedom-class littoral combat ship USS Fort Worth (LCS 3).
The Great Green Fleet is a year-long initiative highlighting the navy's efforts to transform its energy use to increase operational capability.
Image: The guided-missile cruiser USS Mobile Bay (CG 53) receives an advanced biofuel mixture from the fast combat support ship USNS Rainier. Photo: courtesy of US Navy photo by Mass Communication Specialist 2nd Class Andrew P Holmes / Released.