This happened a couple of days ago after running around for hours not seeing anyone, I was at the north west airfield, creeping towards the northern barracks, heard a solitary footstep inside and immediately went DEFCON 1. I circled around to the left side, looking through the windows, turns out that he probably heard me too because he was also circling around the building, looking for me. Luckily I managed to come up behind him and, seeing that he was a bandit, promptly sent his ass through his brain.