They were using Calfire CMD 11 and 9 on Sunday as I drove up the valley. I'm a little hobbled in scanning mobile at the moment but I believe both were linked/simulcasted (as opposed to independent commands covering different areas/zones.) And at one point I may have heard a Division mention using command 6 as a "repeated tac" to get into a remote area near the geysers. Not sure if that was referencing calfire cmd6 or a local lake napa or sonoma fire cmd.
I read somewhere, can't remember now, that Geysers is a critical communications area. So, the need for protection is great!
Could very well be referencing CAL FIRE CMD6. I've looked at Lake, Napa and Sonoma counties. Sonoma is the only county that comes close with simplex tacs 1-5, skips 6, then picks up again with 7.