Probably one of the coolest type rating ever is the Bell 209. The Bell 209, originally developed from the UH1 began its life as the AH1 Cobra. A US Army gunship serving in Vietnam. The AH1 still serves the Marines today, but… it also is used for fire fighting. There are a fleet of Bell 209s used by California to spot out fires.
One of the coolest things I just learned is the 209 with a tank!
Originally built by the Florida DOF, this program was design to use Cobras to fight fires. Florida added a 400 Gallon tank and tested it out on fires. Though Bell supported this idea our friendly Feds did not. At the end the Feds declined this action though the blades are from a Bell 214ST, it’s a UH1 design. To this day Cobras cannot sling load or drop water. This has been your super cool aviation fire history!