The reason for it is quite simple and one that has come from years of political wranglings with the management and the unions.
It stems from the fact that if you put a bullet proof vest on a CVIT operator, the criminals going out to rob will (more than likely) arm themselves to the level to which they need to threaten the life of the said operator.
The vast majority (not all!) robberies are a simple threat of harm with a bat type weapon to which the operator will (or should!) react as per their training and SOP's.
The worst that can happen is a few broken ribs, bruising and post traumatic stress of which is very likely. The very worst is that they could be beaten to death but as of yet, I've never heard of this happening and I hope it doesn't.
The helmet and visor provide good protection to the head, bruises and breaks will mend and the the PTS can be dealt with. If that is a bad as it gets, it's a result, nothing is risk free.
Now, you give the CVIT operators body armour......what to the criminals do!? Arm up and go out doing the same thing they would have previously done with a baseball bat but with that hightened threat of potentialy killing someone, even if it's by accident!
I would agree with body armour being provided to all CVIT operators but only providing it is in responce to the hightened threat that they may or more than likely may encounter.
The guys I use to work with were always going on about it asking for body armour but I always asked them this......what would you like in you face!? Someone holding a metal pipe, or a very nervous bloke with his finger on a trigger!?
As for the assignments / runs they are given, without going into any inside info and SOP's, one job is just as a higher threat than the next, unless the criminals have inside info, there is no way of telling whats in that black box, they all have the training and procedures to follow, if they do follow them, the threat level is massively reduced.
Walks