Captain Sam Axelrad was a U.S. Army doctor in the Vietnam War. One day in 1966, a North Vietnamese soldier, Nguyen Quang Hung, was brought to Axelrad to amputate an arm because gangrene had started to spread in his wound.
"When I amputated his arm our medics took the arm, took the flesh off it, put it back together perfectly with wires," Axelrad told BBC World Service. "And then they gave it to me."
Dr. Axelrad kept the arm for more than 50 years. In 2013, he returned to Vietnam determined to give Hung his arm back.
"I can't believe that an American doctor took my infected arm, got rid of the flesh, dried it, took it home and kept it for more than 40 years," Hung said, adding that he was very lucky to only lose an arm when so many of his fellow soldiers were killed.
Hung, whose Army paperwork had been lost in the years since the end of the war, will use his arm as proof of service in an effort to get a veteran's pension.
"I'm very happy to see him again and have that part of my body back after nearly half a century."