Dark maps, Night Vision Goggles, infrared flashlights and laser pointers

I think it would be epic to have such things in the game. Night Vision Devices will let you see in the dark (though with limited FOV, depending on the type of NVD), and IR lights/lasers can only be seen through those devices. IR lasers are mainly used for aiming through NVG's, since weapon sights can't really be used with them (close objects become blurry), and IR flashlights will be useful in pitch-black conditions, giving you a flashlight that people without night vision devices can't see.

A video with a lot of info that might help: https://www.youtube.com/watch?v=sOrUP0Rq6Jg