190720-N-TI693-0004 MEDITERRANEAN SEA (July 20, 2019) Boatswain’s Mate Seaman Arnaldo Mercado, right, from Caguas, Puerto Rico, and Quartermaster Seaman Anthony Alvarez, from Port Mansfield, Texas, perform a topside check during a chemical, biological, and radiological drill aboard the Arleigh Burke-class guided-missile destroyer USS Carney (DDG 64), July 20, 2019. Carney, forward-deployed to Rota, Spain, is on its sixth patrol in the U.S. 6th Fleet area of operations in support of regional allies and partners as well as U.S. national security interests in Europe and Africa. (U.S. Navy photo by Mass Communication Specialist 1st Class Fred Gray IV/Released)