Anyone remember a photo of supposed American POWs in Vietnam in the early 1980s?

In the early to mid-1980's I watched an episode of ABC's Nightline hosted by Ted Koppel. The topic was on the plausibility that there were still Americans being held captive or were held captive after the war in Vietnam. I don't remember who the guests on the program were. What I do remember is a black & white photo that the program showed. It was a photo of a half-dozen or so Caucasian-looking men standing together. They appeared to be wearing what could have old worn uniforms or work clothes. I believe on one corner or side of the photo...