Daniel Duggan served in the Marine Corps for 12 years before immigrating to Australia in 2002.
They drove up to a base gate in a truck and claimed to be Amazon subcontractors making a delivery, a Marine spokesman said.
The report found the Navy doesn't require thorough enough documentation or training for officials overseeing such complaints.
Five of the injured troops were transported to a civilian hospital, with four released the next day, the Navy said.
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