A 21-year-old decorated United States Marine has died, days after a military training accident at an Australian Defence Force facility in the Northern Territory.

Lance Corporal Hans Sandoval-Pereyra died on Wednesday after succumbing to injuries he received during a tactical vehicle accident on the weekend, a media release from the US Marines said.

He was involved in routine training at Mount Bundey Training Area, east of Darwin on Saturday when the accident occurred and was taken by helicopter to Royal Darwin Hospital, where he died.

One other Marine received minor injuries from the accident and was released from the hospital.

The training was described in the Marine Expeditionary Force media release as routine.

Australian Department of Defense

The cause of the accident is being investigated.

"We are saddened by the loss of Lance Corporal Sandoval-Pereyra," said Colonel Russ Boyce, Commanding Officer for Marine Rotational Force - Darwin.

"He was a beloved member of our community and our deepest sympathies go out to his family and friends.

"We are extremely grateful to our Australian partners for their valiant efforts to save this young Marine's life."

Lance Corporal Sandoval-Pereyra from Fairfax, Virginia, was an Expeditionary Airfield Systems Technician assigned to the Aviation Combat Element.

He had received decorations including the National Defense Service Medal and the Global War on Terrorism Service Medal, the statement said.

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About 2,500 US Marines are stationed in Darwin as part of an annual rotation program.

The accident follows the death of three other US Marines in 2017 when their aircraft crashed into the sea near Rockhampton during a scheduled training exercise.