What kind of aircraft are currently being used by Boulder County to fight wildfires? 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.

I would appreciate any insight anyone can share on this. Thank you.
It's a McDonnell Douglas MD-87, specifically one from Erickson Aero Tanker.

Source: eatanker.com