Hi,
On page 5 of the Alpha Strike Errata v2.2, the relationship between Arrow IV artillery and TAG is clearly stated under Resolving Artillery Attacks, Indirect Fire:
If the attack is from Arrow IV artillery, and the spotter has TAG and is within 24” of the target (6” for LTAG), replace any probe modifier with a –2 to-hit modifier.
Scatter: If artillery misses the target (unit or POI), it will scatter.
The Resolving Artillery Attacks section does not appear to make mention of TAG affecting a direct fire attack from Arrow IV artillery. Is this an oversight, or is it intentional that TAG does not affect a direct fire Arrow IV attack under the standard rules errata?
Also, if it was an accidental omission, could you please explain the rules for using TAG to support a direct fire Arrow IV attack under standard rules?