When the American POWs returned from captivity in Vietnam, military authorities noticed there were no amputees. At the time, this puzzled the experts. With over 2000 men in captivity, one would expect at least a few amputees. But in light of what is known about the Soviet human experimental program, it now makes a lot more sense. Most likely, these men were used either for military experiments or for training young surgeons. As in North Korea, once the procedures were completed the "experimental subjects" were killed and their bodies incinerated.