The annual rotation of the US troops had been delayed because of the coronavirus restrictions.

Defence Minister Linda Reynolds yesterday said US Secretary of Defense, Mark Esper had agreed "our defence organisations' focus is now on maintaining force readiness and helping our partners in the Pacific and Southeast Asia".

"I was pleased to inform Secretary Esper that after careful consideration, the Government has decided that a modified 2020 Marine Rotational Force - Darwin can proceed later this year, adhering to strict measures in place to protect against COVID-19," Minister Reynolds said.

"The decision was based on Australia's record to date in managing the impacts from COVID-19, as well as strict adherence by deployed US Marines to the mandatory 14-day quarantine and other requirements."

This quarantine is expected to be hosted at barracks in Darwin.

"Secretary Esper and I confirmed our respective commitment to ensuring the health and safety of Australians, with special provision for local Indigenous communities in the Northern Territory."

The date and size of the US deployment is still to be announced.

In past years about 2000 Marines took part in the rotation along with MV-22 Osprey tilt-rotor aircraft and artillery.

The exercises have traditionally utilised the Tindal RAAF Base as well.