Tombogan
I hesitate to say this, because it makes me sound like I'm calling vets liars...not my intent. That said, I'm not sure I trust "personal recollections" of vets all that much. There are MANY myths that float around that become legend in the military that are patently false.
M16s not requiring cleaning early in Vietnam is one...drill sargeants were even preaching this. "The .45 will blow a man's arm clean off". "All you have to do is hit a man with a .45 in the arm and it will kill him". That little commie gun can't hit anything at 200 yards. There are still recent vets who swear that the "5.56 tumbles in flight, that's why its so deadly". Urban legends are hard to stamp out and even make it into literature.
If I can see proven scientific evidence, I'm happy to eat my words.