As I remember ,the order was in response to an off-post shooting by soldiers who held CCW permits. The Army regional commanding officer then forbade any permanent member stationed under their command to carry off post, CCW be damned.
The order was eventually rescinded. It was a memorable case as a squadron mate came back from TDY up there and relayed the fact visitors to that regional command weren’t bound by the rule; so ironically any military member who was just visiting could carry as they wished off post.