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U.S. Marines with Marine Rotational Force – Darwin (MRF-D), arrive as part of the force enhancement for the 2019 rotation at RAAF Base Darwin, Australia, July 17, 2019. The increase in MRF-D personnel is a tangible demonstration of the United States’ sustained commitment to the Australia-U.S. alliance and represents an important milestone in the Force Posture Initiatives between our forces.