Firegeezer has some cool video that was shot by cameras installed in a CL-415 Super Scooper and an Erickson Sky Crane Aircrane helicopter. Check it out HERE. Be sure and click the “Full screen view” button.
The narrator says the CL-415 mixes “flame retardant” into the water. It injects Class A foam into the water, not “flame retardant”.
Firegeezer also has a link to a video about some military tanks that have been converted to fire trucks. The simulated “radio traffic” is fun to listen to. And the tanks could be fun to play with.