Now here's a state we don't hear too much from in the milair world! 311.0 is a common Command Post freq for many bases, perhaps Fairchild uses it too. The same for 321.0
There are a couple of sources of good information to help track down frequencies -
a. The first place to go would be the ARTCC UHF milair freqs. Montana seems to be largely covered by the Salt Lake ARTCC, with the Seattle ARTCC in the NW corner. Unfortunately our database doesn't have much for the Seattle site, but it looks like the Salt Lake site is covered. Stay away from the FAA ATA100 listings, as it's well known they are rather dated. Perhaps a quick note to the Washington state and Utah forums is in order
B. Most folks will go to the DoD FLIP site, and download the AP1 planning docs, the US IFR and VFR supplements and the AP1B military training routes. These are found at the very bottom of the pages as defined here...(the ARTCC link is also found here)
http://wiki.radioreference.com/index..._Mailing_Lists
That should give you more than enough reference material to get you going. 73s and GL..Mike