Koppenhafer was 35 and his death is under investigation.
A U.S. Soldier surveils the area during a combined joint patrol in Manbij, Syria, November 1, 2018. Picture taken on November 1, 2018.(photo credit: COURTESY ZOE GARBARINO/U.S. ARMY/HANDOUT VIA REUTERS)BySETH J. FRANTZMAN
