Sounds like the Australian Defense Minister and others welcomed the US Marines to the Northwest Territory, and that US Marine arrivals would be subject to a 2-week quarantine period, anticipating that there would probably be positive COVID-19 cases.
NT Chief Minister Michael Gunner welcomed Ms Reynolds' announcement and said local businesses would get a "massive boost" by having the Marines in the Top End.
"That is exactly what we need right now," he said in a Facebook post.
He added: "We've also secured a number of guarantees to ensure the Territory remains the safest place in Australia."
His spokesman said these included health screening four days before they travel to Australia.
The US Marines were likely to undergo quarantine at Defence barracks in the Northern Territory, the spokesman said.
The ABC is seeking details about where US Marines would be treated if any were confirmed to have COVID-19.
Ms Reynolds said the annual rotation was important for the region.
"Hosting this key Alliance activity provides interoperability benefits as well as signals our firm joint commitment to regional security," she said.
The deployment of US Marines to Darwin was first announced in 2011 by the then US president Barack Obama and then Australian prime minister Julia Gillard.