An Australian woman, said to be in her 60s, was attacked by an American serviceman in the car park of Brisbane's Enoggera Barracks army base.
The 20-year-old US marine allegedly dragged the woman from her car and assaulted her on July 4, according to the Sunshine Coast Daily.
A nearby unit of military police and an off-duty Queensland Police officer intervened and the Aussie cop was assaulted in the ensuing scuffle.
"The [Australian Public Service] staff member was taken by ambulance to hospital and later released. For privacy reasons, Defence will not provide further information on the condition of the staff member," the Australian Defence Department spokesperson said in a statement.
It remains unknown what sparked the attack, as, according to reports, the assailant and the woman were not previously known to each other.
The US Marine has been charged with multiple offences, including serious assault in relation to a person over 60, assaulting police and causing willful damage to the woman's car. He is scheduled to be arraigned in court on July 18.