Well, that guided me in the right direction in that " The FAA has jurisdiction over the VHF AM aviation band. Authorizations are issued each year by April 1st and expire on November 1st" and " These frequencies are assigned and authorized by the FAA, not NIFC". The first link didn't help but the second is useful. If you were to apply the wiki info to the Lionshead fire in Oregon, you will be scratching your head. At some point NIFC contacts the FAA, which in turn directs them to the correct ARTCC to supply the "Victor" frequency, which will show up on the NOTAM.