I have never heard an on-air reference to this TG. BC has been a regular on my listening when I worked in the county and these days as well.
Pure speculation on my part. There has been an increase in the use of drones for fire spotting in the mountain areas since the fire seasons have been unfortunately on the increase in recent years. This is one possibility for this TG if this is in fact the actual name for the TG. Drones are also obviously used for L.E. as well.
I welcome the original database submitter of the TG to jump in on this thread. The database shows this as a multi-tac TG.