The reality is that short of eliminating some access points onto the base in Pet, and less access is precisely what Pet doesn't need, securing the base would actually be quite tough. The base has become a blending of civilian and military over the years. Consider the side towards the river with the Golf Course, marina and campground. Running concertina wire across the top of the hill would ruin on the best views on a base in Canada (the Normandy Officers Mess). Wire is only a deterrent and security can only be provided with patrols and over watch. Without these things wire is defeated by a guy yanking back and forth until it gives way. Even if the securing of the Garrison in Pet was your only concern, the provision of 24 hour gate and roving picket security would require a far greater force then is realistically available.
I think a more realistic security system would see MP's acting as a QRF to any incident and expanded surveillance. Random spot checks, not during rush hour of course, on the gate would help as well.
Funnily enough, much of the training area has more fencing then the garrison. There is a fence running the entire length of Hwy 17 largely so people don't wander into the impact area and has very little to do with security.
