Two officials in offensive backfield?

[Andy]

First of all, I'm not a football official, but being an official in other sports, i do tend to watch and observe officials of all sports.

I was watching the West Virginia - TCU game on Saturday and noticed that they were utilizing two officials in the offensive backfield. I never could get a look at the placard on the back of the second official (he was wearing a black hat as opposed to the white hat referee). My curiosity was especially piqued when I did see an official with the U placard positioned just behind the linebackers.

This was the first time this season that I noticed this particular official positioning. I looked for the same things in the other games I watched on Saturday and didn't see it. Is this a Big XII thing or was I just seeing things?