Claims about Vietnam War Night Vision Devices

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I saw a video about the history of night vision devices, (
View: https://www.youtube.com/watch?v=q9uuGkTgetk
) and someone in the comments claimed that soldiers using red NVD devices saw demons. Does this idea have any merit or can this claim be explained by hallucinations, reflection artifacts,drug use etc. ?

I am asking this with the intent of finding out if early night vision had image artifacts that could look like demons or similar things from folklore/religion, not to start a conspiracy thread.
 
These stories are old, and can continue. Numerous such tales came out of Iraq and Afghanistan as well... "ghosts" marching to execution pits, that sort of thing. I would mark the great majority of such stories to:
1) PTSD
2) Makin' stuff up.

The #2 group are of course lies of various kinds, to entertain or to puff up egos; the #1 are the sad results of people being subjected the the horrors of not just war, but crappy cultures that do unspeakable things as a matter of course.

My Dad was in Viet Nam relatively early; they were issued a single Starlight scope. They lost the thing in the course of trudging through the jungle; when they got back to base without it, they were sent *back* out to retrieve it. Which they did, but they weren't happy about it. No tales of ghosts or demons visible through it, however.
 
View: https://www.youtube.com/watch?v=Bg_L3jmvu6M



Some comments:
“We have deemed your PTSD non-service related”

Something about the Middle East is just spooky. Being out there amongst the ruins of countless civilizations would be eerie, especially at night

I talked to a veteran that told me about weird soviet radio traffic and vanishing thermal signatures of humans, etc stuff relating to that. He told me that its believed those lands are cursed, and when you look into the history of all the armies who went there to die it makes sense. Something in the soil there drives men mad.

Living in the prisons in AbuG there is no doubt in anyone mind that that shit was haunted. You would be laying there on your cot looking up at the metal butcher hook in the ceiling in your jailcell (the hardest points for defensive safety). The pinacle of the ceilings had these little windows that you could pull a chain to open and vent the rooms. Well during the night they would randomly open and close. You would hear walking in the stairwells. You could hear people mumbling and talking in cells that were plainly empty. The number of light globes that shoot around the place was the norm. It was truly hell on earth there.
 
Couple thoughts.

First, the red color. Red lights are used to preserve night vision in general, since rod cells don't react to red light at all. What this means is that you're still using your color vision (cones) as if it's daytime, but if you stay in red illumination for half an hour or so you're allowing your rods to start to adjust to night-time light levels (takes about 2 hours in total) while still using your normal color vision. Which functionally speeds up your dark adaption by 25% or more.

So I suspect that the NVGs started off using a red color as the basis of operation. Except that your rods are actually most sensitive to green light, not red. So anyone looking through a red-tinted NVG would be using their daytime color vision.



Ignoring outright hallucinations caused by drug or chemical exposure or sleep deprivation, I would expect that the helicopter crews saw large bats and owls at night for the flying creatures, and monkeys in the treetops.

Not to mention that NVGs really mess with your depth perception, so a Giant Demon could have easily been a small bat 25ft away.
 

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