161216-N-JI086-057 - MEDITERRANEAN SEA (Dec. 16, 2016) Petty Officer 2nd Class Kathryn Syvertson, from Billings, Mont., replaces an air cylinder on a self-contained breathing apparatus during a general quarters drill aboard the guided-missile destroyer USS Porter (DDG 78) Dec. 16, 2016. Porter, forward-deployed to Rota, Spain, is conducting naval operations in the 6th Fleet area of operations in support of national security interests in Europe. ( Navy photo by Seaman Ford Williams/Released)

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