About 2000 United States Marine Corps personnel and sailors are set to call northern Australia home for the next six months after the 15th iteration of the Marine Rotational Force - Darwin (MRF-D) touched down in Australia’s Top End.

The annual deployment is a vital pillar of the Australia-US alliance and a centrepiece of Australia’s strategic posture within the Indo-Pacific.

Group Captain Melissa Neilson, Commander Headquarters Northern Command, formally welcomed the contingent at RAAF Darwin, noting that each year brings an increasingly refined level of cooperation.

“We look forward to working together again, continuing the close friendship between our two forces and continually building greater interoperability,” Group Captain Neilson said.

“The Marine Rotational Force is a demonstration of the strength of the alliance and our deep engagement with the Indo-Pacific region. It underscores Australia’s ongoing commitment to regional security and strong partnerships with like-minded regional partners.”

Since its first rotation in 2012, MRF-D has grown in scale and complexity, reflecting the deepening defence partnership between Australia and the US and the increasing importance of multinational training in the region.

The latest rotation will participate in exercises such as Southern Jackaroo and Pitch Black in northern Australia, Balikatan in the Philippines, Super Garuda Shield in Indonesia and Operation Render Safe in Papua New Guinea.

Australia's 2024 National Defence Strategy underscored the importance of the Australia-US alliance to national security.