Ten Marine Corps MV-22B Ospreys have arrived in Australia’s Northern Territory as part of a 2,500-strong rotational force, the Marine Corps said Tuesday.

The Ospreys, from Marine Corps Base Hawaii’s Marine Medium Tiltrotor Squadron 363, are deployed to Royal Australian Air Force Base Darwin, according to a Marine Corps statement and information released Friday by the U.S. Department of Defense with photographs of the aircraft.

The tiltrotors, air crew and support personnel make up the air combat element of Marine Rotational Force — Darwin, which began its annual seven-month rotation last month.

The 12th contingent of the rotational force since 2012 will practice expeditionary operations, geographically distributed communications, non-combatant evacuation, embassy reinforcement, humanitarian assistance/disaster relief and rapid projection of combat power

The Northern Territory is poised to play a key role in Australia's future missile defences, according to a Top End MP, as the region prepares for an influx of soldiers and defence force spending.

The presence of the US Marines in Australia's Top End is also poised to grow in the years ahead, with the review recommending an increase to the annual rotation.

The report called for greater "engagement with the US on deterrence, including through joint exercises and patrols; and strengthening Australia's sovereign military and industrial capabilities".

Dr Coyne said this could play out through the arrival in the north of more US ships and fighter jets annually.

"There's a strong possibility that we'll see more often, more frequent US Navy ship visits," he said.

"Certainly we're most likely to see a greater rotational force of US air force craft through northern Australia."

Federal government MP Luke Gosling said the country's north would be prepared to play its part. "There's no doubt that the Northern Territory and the Top End will be part of the [nation's] missile story," he said. "Why? Because we're defending Australia, and obviously, you can get more range into the northern approaches to Australia from the Top End."

The latest rotation of US Marines has touched down in Darwin as they prepare to join Australian soldiers in training in “humanitarian assistance, security operations, and high-end live fire exercises”.

The 2500 member strong Marine Rotational Force-Darwin will spend the next seven months working closely with their Australian counterparts as well as other partner nations from around the region.

It comes on the back of last week’s announcement of the AUKUS nuclear submarine deal, and Deputy Prime Minister Richard Marles said the US continued to be Australia’s “most vital security partner”.

“Over the next six months, the Australian Defence Force and US Marine Corps will conduct a comprehensive range of training activities including humanitarian assistance, security operations, and high-end live fire exercises."

Secretary of Defense Lloyd Austin said Tuesday that the US will increase its military presence in Australia in a buildup aimed at China.

In a joint press conference with Australia’s defense minister and foreign minister, Austin said that the US will increase its rotational forces in Australia. “That includes rotations of bomber task forces, fighters, and future rotations of US Navy and US Army capabilities,” Austin said.

Many countries in the region are not eager to get on board with the US’s confrontational approach to China. The prime minister of Papua New Guinea said this week that his country can’t afford to get caught between the US and China and said he told the US your “enemy is not my enemy.”

Indonesia’s president expressed similar concerns during a meeting of the Association of Southeast Asian Nations (ASEAN) in November, saying the ASEAN must not let the region turn into a frontline for a new Cold War.

Details on the rotational deployments aren’t clear, but they will likely focus on the Australian city of Darwin in the Northern Territory, where US Marines have been rotating through for years.

The US will increase rotations of its air, land and sea forces to Australia and has condemned China’s “dangerous and coercive actions” across the Indo-Pacific region.

As part of the step-up in defence ties, the US plans to preposition munitions and fuel in Australia to support its military forces.

Airfields in northern Australia are set to be upgraded to enable rotations of US aircraft.

Defence secretary also pledges to help Australia acquire nuclear-powered submarines ‘as quickly as possible’ at annual high-level talks.

Austin said the US would “increase rotations of our air, land and sea forces” to Australia as the two countries were “determined to be a force for stability” in the region.

“That includes rotations of bomber task forces, fighters and future rotations of US navy and US army capabilities,” Austin said, adding that the specific details would be worked out by officials and announced at a later date.

The UK defence secretary, Ben Wallace, will join Marles and Austin for a first meeting of the Aukus defence ministers on Thursday.