I was wondering, what kind of aircraft are currently being used by Boulder County to fight wildfires? For example, see photo attached of a plane dropping flame retardant on a wildfire over Left-Hand Canyon in Boulder, Colorado.

[![plane dropping flame retardant on a wildfire over Left-Hand Canyon in Boulder, Colorado](https://i.stack.imgur.com/3ei8i.jpg)](https://i.stack.imgur.com/3ei8i.jpg)

I would appreciate any insight anyone can share on this. Thank you.