Aaron:
You probably forgot,but we discussed this exact thing earlier as it took place in a team game with one unit blowing half the bridges on the Elbe.(Still out there zooming around as far as I know)Security guys were not in positions to guard bridges being placed on VP locations instead.(Which made sense untill this tactic came up)
This was the game before 4.5 so perhaps you have addressed it.I am on the NATO team in the 4.5 so someone else will have to check the security guys.