Wow ! You know a lot about the LoC by living in Germany, my friend I was stationed there. It's impossible to get across except with the help of very few bridges jointly controlled by Indian/Pakistani forces. Between India and Pakistan there is a 80-110 feet deep gorge through which the river Jhelum or Neelum(for the other valley) move with white water velocity. Then of course there is the 80-110 climb back up again to the Indian side followed by razor wire, mine fields, fences, border posts and sentry patrols with dogs. If the militants STILL manage to get across from Punjab(as you say) to kashmir, then you might as well have no military because they must be doing a terrible job at guarding the border.