Tracking through walls would be OP, so just the basic one I suppose. Besides, it would be better if Spotter tries to predict the enemy on his own. It would allow some degree of info on the target, while still allowing the possibility of mistakes on his judgment.

Also, what about his equips are OP? The DC-17's attachments? The Armor? Just let me know and I'll see if I can tweak it. If it is the DC-17, then I think the ammo limitations will balance out its abilities, a soldier can only carry so much ammunition, and there's a very small chance he'll find ammo on the battlefield.