Although it is legal I personally think that vulching is "gaming the game" Unlike actual events in history, the fact of the matter is we know when planes are taking off and we know about when they'll be landing. This wasn't usually known in WWII. Re-directing resources to vulch rather than perform the original intended mission is just point grabbing in my view. If the opportunity is by chance that's one thing but the fact is we Know when the mission starts, we Know when mission ends, waiting at the probably landing time is no different than someone running around with a .45 shooting planes on the deck, especially when the ACK is set at anything lower than normal strength.