is it just the commanders that talk to the helicopters? Or do like the guys on the ground talk to them to like "drop the water here im waiving at you" something like that...also do the heli's talk to each other in the air?
I too was listening to the helicopters well into the night. The helicopters talk to each other on 119.975. This is an aircraft frequency and the ground units do not use it to talk to the choppers. There is usually one chopper that coordinates the others telling them where he'd like them to concentrate, etc. This frequency is very active as the choppers MUST be in touch with each other, letting the other choppers know their location and where they are dropping, when they are "off the ground" after reloading, etc.
The chopper that sits high above the incident coordinating the drops usually will be the one that is in contact with the ground, taking drop requests from Incident command on the Command channel and then relating it to the other airships on 119.975.