About 2,500 U.S. Marines are stationed in the tropical city of Darwin, strategically located on the coastal doorstep of neighboring Indonesia, as part of an annual rotation program that began in 2011.
Lance Corporal Hans Sandoval-Pereyra died on Tuesday after being hurt in the vehicle accident at a military training area about 110 km (70 miles) southeast of Darwin on Saturday, the Marine Corps said in a statement.
"He was a beloved member of our community and our deepest sympathies go out to his family and friends," said his commander, Colonel Russ Boyce.
Sandoval-Pereyra was treated at the scene before being evacuated to hospital, where he died from his injuries. Another soldier was also hurt but was released from hospital and the accident is being investigated.
The accident follows the deaths of three marines in Australia in 2017 when their aircraft crashed during training maneuvers off the east coast.