I'm playing the Germans in scenario 272. No matter which unit I use to call in artillery, even the artillery VB, the screen says that A0 is the spotting unit and the map on the artillery screen shows the observed hexes as being from A0. Why is that?
That's a very flat map.
It could be neither the AO or Foo has an LOS in which case the one with the better arty call ability may do it is my guess.
At any case,the A0 is just about as good a the FO in calling in arty (when out of LOS) in scenarios and single battles.
Exception to that "if" the designer made the FO more experinced and/or if the FO has good LOS and not suppressed,then you get the full benefit of a FO class.