What are some PRO sports teams that have the name Rebels?

My teacher recently gave us an ignment where we chose 8 cities that didn't have a NFL team. The team name could not be copied from any other NFL team and had be be frightening. My group and I did so but we received a point reduction for one of our team names. That team name was the Austin Rebels(Texas). My teacher claims it's racist and the only way to get the point back is if I find a PRO team that has anything to do with the confederate people. I honestly don't think this is racist at all and is just a cool threatening name. When I tried to explain to him that there was two colleges with the rebels name he said it doesn't matter and it has to be pro. If you could give me examples of teams that have ANYTHING to do with SOMETHING confederate(symbol, name, mascot, etc) or another PRO team with the names it would be greatly appreciated.