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The guided missile destroyer USS Donald Cook (DDG 75) transits the Black Sea while participating in European Phased Adaptive Approach April 21, 2014.
U.S. Navy guided missile destroyers operated in the Black Sea on a mission to train with partner nation navies and promote peace and stability in the region. (DoD photo by Mass Communication Specialist Seaman Edward Guttierrez III, U.S. Navy/Released). Original public domain image from Flickr
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