SOUDA BAY, Greece (Feb. 20, 2021) Cmdr. Christopher Petro, executive officer of the Arleigh Burke-class guided-missile destroyer USS Porter (DDG 78), receives the COVID-19 vaccine from Hospital Corpsman Kevin Gonzalez in Souda Bay, Greece, Feb. 20, 2021. Porter, forward deployed to Rota, Spain, is on its ninth patrol in the U.S. 6th Fleet area of operations in support of U.S. national interests and security in Europe and Africa. (U.S. Navy photo by Mass Communication Specialist 2nd Class Damon Grosvenor)