With the constant migration of police, fire, and business, Land Mobile radio comms to VHF-Hi, UHF, 700 MHz, and 800 MHz, trunked radio systems, VHF Low Band has been fast becoming a deserted wasteland. Surely there is available spectrum between 42 and 50 MHz. Motorola produces little if any Low Band gear, anymore. Kenwood has been a "go-to" for Low Band gear, but I understand their presence in that market may be dwindling with the demand. The military has always had a presence there AFAIK, at least back to the Vietnam era. Surely they don't need the entire 30-50 MHz all the time.
I recall during what was the largest manhunt ever in my state, in February of 1974, National Guard APC's and possibly helicopters were operating on 42 MHz Highway Patrol frequencies to coordinate with them. They had frequency-agile gear and it sounded to be transmitting a broader signal than the HP radios, during the manhunt for 3-4 cop killers who murdered a deputy and seriously wounded another, as well as murdered a town police officer the night before.
In the early 1980's, I would hear military aircraft doing practice bombing or missile strikes on local telephone microwave towers on 49 MHz. It has been many years since I heard any such activity. I imagine they too, have moved to higher spectrum.
The shorter wavelength of these frequencies would allow for easier antenna placement in mobile or portable applications than with CB. It would also allow for better signal peneration into and out of automobiles, as well as brick and stone buildings. A real plus for rural and mountainous areas would be realized through dense foilage as well as "knife-edge" propagation over and around hills and mountains. Such a band would be far better in rural environs than UHF.