[Mobhack]

Missiles require the firer to be halted (though if they have a stabiliser, you can move as far as the stabiliser rating and still get a (reduced chance) shot - st least for ATGM. I'm not going into the code to see if that also applies to SAM).

Helicopters with SAMs are really just another form of mobile SP-SAM, and were really only there for helo on helo action. But they will pop off at strike air on occasion.

Personally I do not bother - I take the helo with more ATGM or whatever if there is a choice, as I prefer my SP-AA to be dedicated vehicles placed on over-watch and I would rather that any chopper I buy had those few extra anti-tank weapons. In addition in battles you usually either have air superiority (so no enemy air about), or the opposite (so you dont have the helos, bar any campaign core ones!). Air parity is comparatively rare, where both sides get roughly similar number of air strikes at purchase time. Therefore, in my opinion, helos with SM on board are generally a waste of points, since tank or grunt bashing (depending on weaponry) is their prime task - not stooging around as mobile AA systems.