Japanese coast guard boats escort the Nimitz-class aircraft carrier USS Ronald Reagan as the ship prepares to enter Sasebo harbor in Sasebo, Japan for a port call. The Ronald Reagan Carrier Strike Group is on a routine deployment in the U.S. 7th Fleet area of responsibility. Operating in the Western Pacific and Indian Ocean, the U.S. 7th Fleet is the largest of the forward-deployed U.S. fleets covering 52 million square miles, with approximately 50 ships, 120 aircraft and 20,000 Sailors and Marines assigned at any given time.