I don't have access to DWAN at the moment, but I do recall that there are a few postings to Alberta, a handful for Gnr-Bdr if that's the rank level we're talking about, maybe 4-5, in Suffield as Range control, and about as many in Wainwright at CMTC, but these are not as high a priority to fill as the postions in Field units, and as already mentioned, none of these are in BC or Alta.
You may have noticed this shortage of gunners given the increased gunner air time in the latest recruiting campaign ads.