Several times now I have tested AI ability to see in almost pitch black, moonless and slightly overcast nights.
Despite the fact that when I take over any of the teammates who are not wearing night vision, I can't see jack shit. AI enemies who are NOT wearing NVGs go out on patrols, engage my troops, wound and kill them.
For a game that is supposdly so sussed up on its 'realism' this to me is absolutely ridiculous. As far as I can tell NVGs are effectively useless because the AI can basically see in the dark even without them. My troops are just as guilty of it as the enemy AI.
There must be a mod that fixes this; wait, no . . . there probably isn't because the code behind "sighting" enemies is probably inaccessible, and part of the reason why a seemingly impossible glimpses of the enemy just around the flank of a wooded hills side or beyond the crest of a wooded hillside seem so common.