To answer the original question of why there is no full time army presence in BC:
A while back, the base in Chilliwack was home to the Engineer Branch, the Canadian Forces School of Military Engineering, the Canadian Forces Officer Candidate School (CFOCS), and supported all the army reserve units in the BC. With the extensive cuts made to the military in the '90s, it was no longer affordable to keep a lot of the bases open, so many of them were closed off and the personnel and equipment moved into other bases. Chilliwack wasn't the only victim, CFB Griesbach in Edmonton, CFB Calgary, about 3/4 of CFB Shearwater in Halifax, Saint-Hubert Garrison in Quebec, and Wolseley Barracks in London Ontario have all been acquired by Canada Lands Company. There are also plans for more closures - such as the 39 CBG HQ in Jericho, Vancouver and all the military buildings, including PMQs will, eventually, be sold off and redevelopped.
Until such a time as the CF receives enough funding to make us viable and able to sustain ourselves, no doubt such closures and acquisitions will continue.