In the Operation Cyclone rules, it says this "Artillery weapons (range A) can never be used inside buildings! They would hit the ceiling before having the chance to reach an enemy! For this reason, when you play a scenario that takes place inside a base (grey tiles), you cannot use any weapons with range A." (pg. 7)
The FAQ has similar, but slightly different wording. There it says "Q: Can Artillery weapons (Range A) be fired from inside a structure?
A: No. Artillery weapons fire in a parabolic trajectory. Any artillery weapons fired from inside a structure would hit the ceiling of that structure and explode, making it very dangerous for the artillery unit!" (pg. 8)
The Operation Blue Thunder rules included with the Terrain Tile Set say this: "There are two types of terrain tiles: snow and warehouse. There is no gameplay difference between a snow tile and a warehouse tile, so players can use any combination of terrain tiles they like." (pg 2)
It seems like these rules kind of contradict one another.
I suppose it comes down to whether or not being on a base/warehouse tile counts as being in a "structure". I find it interesting that the very specific wording in Cyclone that artillery weapons can't be used in base/warehouse tiles is missing from the FAQ.
Personally, I'd be inclined to stick with the Cyclone rules, because they seem more logical and force some variety in troop selection.
But maybe I'm just biased because the Allies keep dropping Steel Rain rockets on my beloved Axis forces.
What do you folks think? Is this another question for the rules gurus at FFG?