a company owns the guns which are being carried by her employees - ATC holders - while on duty in a uniform,
usually an ATC holder is allowed to take a company's gun for an initial and yearly ATC requalification courses,
no ATTs are being used/issued, and no guns' registration certificates are being possessed by employees ...
but a company would not allow any other use of her guns ...
so, for the training, an ATC holder carrying a company handgun on duty would need a personal one ...
one of the problems with these brainless crappy new rules, the current initial training for an ATC (5 days) is inadequate for a novice fresh from RPAL course,
being heavy on Use-Of-Force aspects and relying on previous actual shooting skills to pass practical tests ... and these skills are now nowhere to be acquired ...
as to keeping them on a level required for requalification ..
this is my personal understanding, I may be mistaken ...