I'm going to go with -Support
My main reasons for this is, I don't think it would make a lot of sense for dispatch to be driving around, they use to be able too, but it just led to a lot of unnecessary and preventable situations, considering they are (or I'm pretty positive they are) a neutral class, if they somehow ended up in gun fire, and got killed it could cause issues. Another issue I have with this is, even if dispatch could get on scene, it still would be very hard to tell which specific units are on scene at the situations just by looking at the cop cars, unless they got out.