This is a standard type Exoskeleton, where the Night vision module has been replaced with a more modern model, providing superior image enhancement when compared to the regular armor. Originally, it belonged to Fang, the "brawn" of Strelok's Group. It is the only known suit of its type and cannot be repaired or replaced. If it were not for the uniqueness of this suit, it would easily be one of the best suits in the game.
It can be found in Fang's grave in Pripyat, a stash Fang's goodies. This is the only way to get it. Stash coordinates are given by searching the body of a stalker in Yantar, usually the one in the tunnel beneath Lab X-16.