Grand slam seemed to bug out for me, helped the left side ground units first taking out the reds for three waves, no more spawned there so i went to help the airport center forces, on the second or third wave there the rest of the targets there vanished, thought it was odd went to help the ship and like 2 or 3 min after i got mission failed eventhough least on comms it sounded like i was doing a good job helping my units out. dunno why