You are in charge of staffing, but in the end, it is the department that determines where the position is, that is, whether or not it is in a region.
I worked in a region, in Quebec City, for the Department of Indian and Northern Affairs. We were in main offices. It was something I always wondered about. I saw a difference between the approach used for an office in a region and the approach used for an office on the Hill. The approach is different in terms of front-line services.