A U.S. Army veteran who went missing during Vietnam and has been listed as M.I.A. since may have been found living in Vietnam, according to a new documentary.

The missing veteran, former Green Beret John H. Robertson, was reported killed in action in 1968 while flying a helicopter over Laos. Another Vietnam War veteran said he found the missing veteran.

After his death was reported, Robertson had his name engraved into the Vietnam War memorial is Washington, D.C.

The man is now 76, and claims to be the soldier who was believed to be dead. The two daughters of Robertson said he has never contacted them, and they both have refused to take a DNA test to prove his identity, according to the Daily Mail.

"Somebody suggested to me maybe that's [because] the daughters don't want to know if it's him," Jorgensen said. "It's kind of like, 'That's an ugly war. It was a long time ago. We just want it to go away.'

"I don't know," he said. "What would compel you not to want to know if this person is your biological father?"

The documentary that addresses the man's possible identity as the missing Vietnam veteran is "Unclaimed," a new documentary film by Michael Jorgensen.

"The M.I.A. story was pretty unbelievable, pretty grandiose," Jorgensen told the Daily Mail. "I was very skeptical."

The documentary follows the efforts of Tom Faunce, another Vietnam War veteran, who attempted to find and identify Robertson.

"The ghosts of 1968, the faces of the people I have lost have never left me," Faunce said in the documentary, in a scene that can be viewed in the trailer. "A wise man once said time heals all wounds.

"One thing that's certain, that man never went to war," Faunce said.

The missing man has a translator, Hugh Tran, who said that he spoke exactly like a Vietnamese native and has no trace of an American accent.

"I still didn't believe...until I saw the family reunion," Tran said.

After being reportedly identified, the man has chosen to remain in Vietnam.

"There's maybe a bit of a misconception: everybody assumes, 'Well, obviously, he wants to come back to North America,'" Jorgensen said. "But at this point he's happier being there, taking care of his wife, to whom he feels an incredible amount of loyalty, and their kids."

The trailer for the new documentary, "Unclaimed."