National Archives Records provide the following information:
Michael James Themmen’s home of record is Las Vegas. He was a ground casualty, killed due to hostile fire from small arms or gunshot fire in the Republic of Vietnam (South Vietnam) in military region 3 (Tay Ninh). His body was recovered. Single. Latter Day Saints (Mormon).

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If you have information about this servicemember, please email pio.ndvs@veterans.nv.gov so we may verify your information. We would love to hear from relatives. If available, please email photos too so we may fully share the life and times of this Nevada hero.