VHF high band analog in narrowband or soon-to-be-narrowband is the working radio system for NCFS, and some of the NCFS personnel are carrying VIPER radios because of the NCFS responsibilities in NIMS responses. Some of the private forestry cooperators may still be on low band, hence the retention of the low banders for continued comms in the areas where those timber companies have their plantations and have fire control equipment of their own.
The Southeastern Forestry Compact, made up of the forestry units of the various SE states, uses VHF high band 151 and 159 MHz freqs, and the SE Compact Common Channel is 159.285 csq. They also have the national 154.265, 154.280, and 154.295 csq wideband/narrowband channels as well as the rest of the national narrowband fire common mutual aid channels in the 154 MHz range for use with local FD comms.
These are the bits and pieces I have. Somebody else here is bound to know more.