Camp Fortitude

My apologies if this is something that has already been discussed and ruled out as a possibility for any reason, but have you lot considered a CCTV system? A way to monitor the inside and outside of the walls separating us from the outside, I mean? It could go rather a long way toward giving us advanced warning of an oncoming threat. I could set it up in a day if I had the cameras to do it... It would require some doing, reconfiguring the cameras to a wireless power source so that we can charge them remotely, but I could do that, too.