Had the feeling AI always knew where I was after engagement, now I'm sure.
AI dramatically needs improvement as its behaviour sometimes ruins immersion.
Nothing more annoying in a game than the feeling that AI is cheating.

Like RTEK, in a night mission ("night" showcase), AI soldiers spotted me when I was in the lowest crouch stance, and killed me very easily, from a long distance. Without NV Googles.
Had to prone to get unnoticed, which could be realistic in day time, but not by night IMO.
After engagement, I tried to move from cover to cover, but AI shot me at the second I moved, always by night and from a long distance.