The Marine died of injuries sustained in a “tactical vehicle mishap” in the afternoon, the I Marine Expeditionary Force said in a statement.

The Marine’s name was not released, and the cause of the incident was under investigation.

Officials said the death was not related to Steel Knight, an annual, large-scale training exercise that began Monday on the base.

No further details were given.

The I Marine Expeditionary Force is the largest of the three Marine expeditionary forces and is located on the coast in San Diego County.

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