I havnt heard anyone say this was happening, theoretically it could happen but i believe highly unlikely. From what i remember you need full movement points in order to blow a bridge so you cant fly out and blow it on the same turn and these units are assigned to brigade/divisional HQs so would be out of C&C pretty quick if you flew to far out and that would slow them down, Now i can say i have divided up the Grentruppen and Czech border units into company level so security will be much tighter in EGermany/Czech area plus a little bit into West Germany in 4.6. When i have some time ill run a little test on it and see what could be the worst that could happen.