Amid the backdrop of the United States and Australia strengthening military co-operation while tensions in the Indo-Pacific ramp up, U.S. Marines are currently undertaking protection and evacuation training in Australia's Northern Territory.
The group, part of a contingent of more than 2,000 marines based in Darwin until October, are stationed on Bathurst Island, part of the Tiwi Islands north of Darwin, and have spent the past week training to carry out evacuation missions.
Master Gunnery Sergeant Robert Robinson said marines carried out non-combatant evacuation exercises about once a year.
"We can always be called upon to do it and we never know when that time's going to happen, so we have to be prepared when the time comes," he told the ABC.
Young marines need to be alert for days on end during the scenarios, as angry mobs threaten to breach security fences and challenge them.
"What we want to do is prod them and poke them over a couple of days and see if we can't get under their skin," Robinson said.
Dealing with intruders, suspicious packages thrown over the fence, and suicide bombers are some of the challenges the marines are confronted with, and the command team meets daily to come up with new ways to test them.
"We start off very small and then build up and build up and then like ... it gets like the worst case scenario," she said.
"And then how do you respond? We kill off their leadership or we take away comms and then they have to deal with it."
Working with the Australian Defence Force (ADF) and regional partners, the MRF-D participate in a range of activities, exercises, and training.
Team members also engage broadly with local communities, volunteer at schools and in Aboriginal communities, and support natural disaster clean ups.
Another major event to be held soon is Exercise Talisman Sabre, the principal Australia-U.S. bilateral military training activity, conducted biennially and focuses on high-end warfighting.
"It provides the U.S. military with a forward operating base from which it can launch into the [Indo-Pacific] region," he said. "There is clear evidence that the U.S. government is going to invest more, ensuring that supply chain defence logistics facilities are present in northern Australia and ready to support a range of contingencies."