There has been plenty of veterans who have fought in both World War II and the Korean War, but I think few have fought them quite like Mr. Welzel who was born in Ohio, but his German father moved back to Germany when he was two years old for a job opportunity.  Welzel’s life in Germany eventually led to him joining the Hitler youth and fighting for the Nazis in World War II before being captured:

“You had to consider yourself a German if you wanted to stay alive. … You had to play the game,” Welzel says.

On Oct. 10, 1944, just shy of his 18th birthday, Welzel was captured on a hill north of Florence, Italy. Soon afterward, an American officer who spoke perfect German began to interrogate him.

“Should I tell him I was born in the United States or shouldn’t I?” Welzel thought to himself.

“The next guy was like sittin’ 10 feet over — the next German soldier, waiting for his turn and, you didn’t know who to trust,” Welzel recalls. “I never told anybody that I was an American citizen by birth. That was my secret. It was my highest secret, so I didn’t dare tell him.”  [via This Ain't Hell]

After World War II Welzel joined the US military and fought in the Korean War.  You can read more about him at the link.