150910-N-AX546-140 BLACK SEA (Sept. 10, 2015) Machinist Mate 2nd Class Sean Thomas, from Inglewood, Calif., relays propulsion readings from the central control station aboard the guided-missile destroyer USS Donald Cook (DDG 75). Donald Cook is participating in exercise Sea Breeze 2015, an air, land, and maritime exercise designed to improve maritime safety, security, and stability in the Black Sea. (U.S. Navy photo by Mass Communication Specialist 1st Class Sean Spratt/Released)