I'm actually most of the way done with a prototype of a quadcopter that can be deployed on a scene that just orbits and streams video to a monitor in the chiefs vehicle. It's mostly off the shelf components, with a little bit of 'wrapper' that makes is easier to deploy.

The biggest issue I haven't sorted out yet is the batteries... LiPo batteries are great in terms of capacity/weight, but if you keep them fully charged all the time, you kill them pretty quickly...