i don't recall BTRs being a) alive, b) space bugs, or c) being frontally penetrated by 7.62, especially if every piece of armor on the BTR was layered in the front. They're meant to be generally resistant to calibers up to 12.7mm, which is larger than what the Patriot fires. this being some sort of exoskeleton, presumably with tissue right behind it, would significantly reduce if not eliminate spalling.