All 2,200 US marines will need to do a do a COVID-19 test and be able to show a negative result before boarding the plane to Australia.

The Department of Defence says each marine will have to do a coronavirus test within 72 hours of their departure and show a negative result before boarding the plane to Australia.

After they touch down in the Northern Territory, the marines will have to do another COVID-19 test and then undertake 14 days of quarantine. Before leaving quarantine, each person will be tested again for COVID-19.

To accommodate the large group, the Marine Rotational Force — Darwin (MRF-D) unit has rented a secure facility outside the NT capital for most of the US arrivals to quarantine in.

The first two groups, however, will quarantine in isolated accommodation on an unnamed Australian Defence base.

The arrival of the 2021 cohort will be the 10th annual rotation of US marines in Darwin.

The Biden Administration will likely be "focussed on national securities," meaning Australia may have to make harder choices in the defence space, according to the Lowy Institute’s Richard McGregor.

“Trump was focussed on trade,” Mr McGregor told Sky News. “The Biden Administration might be much more focussed on national securities.

“That might mean harder choices for us in the defence space.”

Mr McGregor said this may mean the US would expect Australia to look at things including “intermediate range missiles” and the possible placement of “more Marines in Darwin”

“They might like us to do greater naval exercises in the South China Sea,” he said. “I think they’re going to expect us to step up as a strong ally.”

As tensions between the US and China continue to simmer, researchers say the Biden administration could put a strategic spotlight directly on the NT's capital, given its proximity to Asia.

"There will probably be a rotational agreement like what we see with the Marines and the Air Force, but with some US Navy warships," Mr Thomas-Noone told ABC Radio Darwin.

Professor John Blaxland, of ANU's Defence Studies Centre, said Darwin would "likely see considerable additional attention in the coming weeks and years".

He said with the new administration "likely to continue to apply pressure on China" and come looking to Australia for additional help, it may be the Top End city that answers the call.

"Darwin's going to be more on the crosshairs than it has been for some time now," Professor Blaxland said.

THE United States’ combat logistics support agency is moving on plans for a multimillion dollar fuel farm facility in Darwin for its fighter jets and warships.

The fuel reserve is being established in Darwin to ensure US war machines are not left stranded if fuel supply lines are disrupted.

DLA Energy is seeking information on “industry capabilities/interest/potential sources for the receipt, storage, and issue 1.2 million barrels of aviation turbine fuel, grade JP5 (fill capacity), and 700,000 barrels of commercial jet fuel, grade jet A-1 (fill capacity), in the Port of Darwin, Australia.”

It also seeks information from interested companies on their service capabilities for receiving and shipping US government-owned product via an ocean-going tanker or barge on a 24-hour per day, seven-day per week basis.

Darwin port has always been a safe haven and vital asset in a sometimes unstable region.

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The 2016 Defence White Paper committed the Government to increasing Defence’s international engagement particularly with countries in the South Pacific and South-East Asia. Darwin provides a fit-for-purpose hub from which to base ADF assets prior to deployment into the region as part of its enhanced international exercises.

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