The U.S. Navy's nuclear-powered aircraft carrier Ronald Reagan left the Yokosuka naval base near Tokyo on Thursday after completing a nearly nine-year tour of duty amid rising tensions over provocations by China and North Korea.It will be replaced by another Nimitz-class vessel, the George Washington, which was deployed to the base from 2008 to 2015.The Ronald Reagan will stay on alert in the Pacific Ocean as it heads to a navy maintenance facility in Washington state, the U.S. military said.The Ronald Reagan arrived at Yokosuka in October 2015 and performed patrol duties in the surrounding…READ FULL ARTICLE