He is talking about Huber having access to the 470th Military Intelligence Brigade, located in San Antonio Texas.
I looked at the three times "470" was mentioned in q-drops. In two of them, it seems clear that Q might be talking about the 470th MI brigade because the context
How large is Muellers team? 20-25? Think 470. The more you know. Q(that could have been a reference to the 470th MI brigade)
Ask yourself - who is filing the indictments? It would take a very large team to work this quickly. Who has that kind of manpower? 470 Q(that actually looks like 470 is meant to be a "who", not a quantity) so again, that implies it is the 470th MI brigade
(Reddit Summary) -Sessions informed Congress in his letter that all the matters recommended for investigation by Goodlatte, Gowdy, and Grassley are fully within the scope of [Hubers] existing mandate. He also informed the chairmen that Inspector General Michael Horowitz, who is working with Huber, has a staff of 470 investigators,(that one is NOT a quote from Q. That was a reddit summary that someone else posted, and in my opinion is mis-information or a mis-understanding that someone ELSE (not Q) posted on Reddit. It could also mean "investigators from the 470th brigade"
We know from the earliest Q posts that Q is "MI" Military Intelligence, so the 470th MI brigade makes the most sense. ALSO, it means military tribunals are MOST LIKELY