In our shop, all roster moves are communicated to the same group. Security is on the list, as are several others. Security manages building access and alarm codes, so Security needs to be aware of each move. Notice goes out ahead of time of voluntary departures.
If it's an involuntary termination, Security is notified prior to the termination if there is a concern with misuse of building access. If no such concern exists, then Security is notified by the end of the day. Of course, on those rare special occasions with elevated concerns, Security is invited to participate in the termination.