11.4 Special Aircraft Anti-Tank Fire question.

[Tambu]

In shared or face-to-face, I have always rolled a M2 check if ANY unit takes a step loss in a hex no matter if it was inflicted by AT, BF, DF or OPFIRE.

I concur with this opinion in a general sense, but note the important exception of AT fire-related hits in a hex that also contains personnel units. Hits from armor piercing weapons on AFV's, would only cause M2 determinations for the armored vehicles involved, not other units or leaders in the same hex.