At the NIMBUS Lab we have been working for several years now on developing safe micro-UAS based systems to not just observe but also to actuate close to the environment. The latest chapter in this effort consists of a system to support control fire burns from the air.
UNL News just published a short story on it.
You can read more about the need for such fires and new tools at our brief tech report (draft version).
And you can see them in action in this short video.