The name of the man was being withheld until his family could be notified.
Guard officials said the soldier collapsed on Tuesday and died Wednesday at a Tempe hospital.
The cause of death will be determined by the Maricopa County Medical Examiner’s Office.
The man was a member of the 850th Military Police Battalion located at the Papago Park Military Reservation in Phoenix.
Guard officials said the man was a member of the Phoenix Police Department in his civilian status.
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