191017-N-UB406-0002 GULF OF CADIZ (Oct. 17, 2019) The Portuguese navy frigate NRP D. Francisco de Almeida (F334), left, approaches the Spanish navy replenishment ship ESPS Patino (A-14), center, for a replenishment-at-sea during exercise Dynamic Mariner 2019 as seen from the U.S. Navy guided-missile destroyer USS Gridley (DDG 101). The NATO Maritime Command-led Dynamic Mariner/Flotex 19 (DYMR/FL19) is an exercise that tests NATO's Response Force Maritime Component and enhances the flexibility and interoperability amongst Allied nations. DYMR/FL19 involves ships, submarines, aircraft and personnel from eighteen Allied nations converging off the coast of Spain. (U.S. Navy photo by Mass Communication Specialist 2nd Class Cameron Stoner/Released)