ATLANTIC OCEAN.
Sailors prepare to stow self-contained breathing apparatus masks aboard the Arleigh Burke-class guided-missile destroyer USS Ross (DDG 71) during a general quarters training scenario, June 16, 2017. Ross, forward-deployed to Rota, Spain, is conducting naval operations in the U.S. 6th Fleet area of operations in support of U.S. national security interests in Europe and Africa. (U.S. Navy photo by Mass Communication Specialist 3rd Class Robert S. Price/Released). Original public domain image from Flickr.