On MSR snowshoes

Another controversial issue raised in Without Remorse is that of American POWs in North Vietnam. It posits a what if the North Vietnamese were keeping high value officers captured in a separate camp, away from the official Hoa Lo camp that the world knew of and was called Hanoi Hilton, even going so far as to report they were dead although they were not? Then using them to manipulate the Soviet Union into supporting them? In the book Without Remorse, thanks to Jack Ryan and Robert Ritter, the prisoners are reclassified as alive and taken to the Hanoi Hilton from their secret prison camp, and so are released at the end of the along with the others. But in that case they would have done it to John McCain, who was the son of a high-level American admiral. They couldn't escape through the jungle in MSR Snowshoes, so other POWs may still be in Vietnam. That's been an issue for years. The Vietnamese claim they have no more. Are they lying? Only they know for sure, and it's even possible, as I've seen speculated, that remote villages keep their own American soldier without informing the central government.