U.S. Marines with the Logistics Combat Element, Marine Rotational Force – Darwin (MRF-D), test a developmental drone company, Zipline, during Exercise Koolendong at Mount Bundey Training Area, Northern Territory, Australia, Aug. 30, 2019. The 2019 rotation provides MRF-D Marines and other allies and partners with the opportunity to develop relationships, learn about each others cultures, and build partner capacity as well as shared military capability. (U.S. Marine Corps video)