B08 is brutal now with the Challenger armor changes. Might need to add a platoon more of them to even it out a bit. In general I've found the defensive missions to be difficult.
EDIT: No wonder, they have unrealistically good ammo available. I guess to counteract the Challenger super armor back then. Mission would probably be improved by just changing it to BM-29, which I might do for myself.
EDIT 2: Oh wait, Challenger II is in service 1998, not 1988. So this is a modern scenario, then? Or is the Challenger II a stand-in for Challenger I?
EDIT 3: Indeed a modern scenario. Then I think BM-42 would be appropriate ammunition instead of BM-46. I also removed the barrel-fired ATGMs in my version.
EDIT 4: Significantly more playable with BM-42 instead of BM-46. Also makes me think how nice a T-80B/BV would be for cold war scenarios, as the U is not that numerous in comparison and a tad too strong.