Mines being laid anywhere......Might be a bit annoying if enema's can lay mines not only around your base but ON the runways.
...cheers eh!
edit.... I seem to remember a WWII air mission being contemplated to drop caltrops (star like / triangle thingies) onto enemy airfields to puncture the tires of landing/taking off planes. That is until someone pointed out : If you're already over the field why don't you just drop bombs!!