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A U.S. Marine with the Ground Combat Element, Marine Rotational Force – Darwin (MRF-D), interacts with Australian Army soldiers during the opening ceremony for Exercise Southern Jackaroo, Shoalwater Bay Training Area, Queensland, Australia, May 19, 2019. Southern Jackaroo is a trilateral exercise hosted by 6th Battalion, Royal Australian Regiment, in conjunction with MRF-D Marines and service members from the Japanese Ground Self-Defense Force. The exercise will focus on collaborative training in order to exercise interoperability between the U.S. and partnered nations.