[thatguy96]

I don't know what the decision making process on it was, I was just quoting from the manual where it said that unlike all other mortars they don't have indiret fire capability.

I personally would have thought that airborne mortars would also be capable of indirect fire, but someone probably decided that units all the way on the other side of the map calling in fire from mortars that would likely be way out of contact would be a bit inaccurate.