As far as I know, there was only one firehawk flying and one planned to be airborne soon
No, "Brainerd Helicopters" has two already and they are working on a third one.
And LA County has two or three Blackhawks converted as well and I think they're getting another one as well.
LA Co. has the fixed tank underneath (yellow machines) and Brainerd flies them with a bucket and a camera system to see what the bucket is doing.
Their ships are red-white-and-blue. Looks pretty good actually.
To Frank:
I fly "Panaca Jane" man!! Didn't you see the pictures?!

(it's based in Ely,Nv for the summer and it's pretty much "my" ship so to speak)
Right now I am in Arkansas with a Bell 206L3 LongRanger until the end of the month....