In the case of a major BFC facility going down under attack, they employ Admin units and managers of lower ranks to be the final lines of defence.
Without the ORC Chip, they often run or try or escape.
The damage they can inflict on the enemy is light, however it buys higher ranking staff time to escape.
Also having the Admin units as active combatants entices the enemy to eliminate them, which is good for keeping company secrets safe.
Also too, the collars are locked and the chains require heavy equipment to cut, which makes removing the admin units from the facility impractical.