I would imagine it could be any number of CUs. If you became a member, wouldn't you know which one it was?
One doesn't necessarily have to become a member right off the bat to be offered some pre-qualified products. USAlliance is one that comes to mind, DCU is another (IIRC), some local ones also do this while you "shop" around. Becoming a member would be usually the next step if conditionally approved for the product.