For example, in this case, I have not moved or attacked with any units yet. I am only looking at ranged Panzergrenadier attack on an American armor unit. Only 3 GrWs can participate.


I would expect the unmodified offensive power to be 3 (3 guns) * 12 (hard attack) = 36. But instead it's only 24:

There should be no range reduction for this gun according to the Ranged Weapons table.
How is this "rough estimate of the offensive value of the forces" calculated? This seems like the most important number on the screen to me.