What is exactly the expected AI behaviour, if you had to define a ruleset for the game?

I would expect they would try not to reveal there squadmate's location to the enemy. I would also expect them to move more cautious when they have no NVGs and cannot see far, unless they use a flashlight.

Reminds me to how AI used it in A2/OA:
http://www.youtube.com/watch?v=9BPepER96go

This is Simple to solve.. somewhere in the code of the game there is a snibbit that says something along the lines of ... if (unit x has a flaslight && in COMBAT mode ) then {turn on your flashlight and give away your pos like a moron}

it should be something like this:

While {unit x has flaslight && (NOT in COMBAT mode || Not in STEALTH mode} do { turn on your flash light so you can see.. but as soon as your in combat or in stealth mode turn of your light and hide you idiot}

its that simple.. If ai have a flashlight and they are set to "CARELESS","SAFE","AWARE" then they should feel free to use their flashlights.. as soon as they get into combat, or get set into stealth they should turn it off.. its stupid that they turn their lights on and show where they are when their shot at. it should be the opposite. Even better Add a check for nvg and laser pointers as well.. if they have nvg and a laser use it...