U.S. Navy Seamen Steven Lopez and Nickey Barnes practice vertical replenishment with an SH-60 Seahawk helicopter on the flight deck of the guided-missile destroyer USS Jason Dunham in the Caribbean Sea, Feb.18, 2015. The destroyer is supporting Operation Martillo, a joint operation with the U.S. Coast Guard and partner nations, in the U.S. 4th Fleet area of responsibility. The helicopter is assigned to Helicopter Maritime Strike Squadron 46.