Why can't my FO order his mortars to fire

[Artofwar]

Thanks IMP its starting to sink in now how it works. Other issues I had (it's my families fault and there heredity) is I was trying get the AO to have the mortar fire on a hex but it would not do because the hex I wanted to fire on was out of the RANGE of the mortar. Then I wanted a mortar to fire and it was like ... Where is the mortar .... well I had loaded it on a truck so duh ya can't send a fire mission now noobie . .oh otay Now I'll try and figure out the radio stuff the IN Contact thing I figured out too.. It's like 3 or 4 hexes according to the manual.. for inf at least the month year I'm playing at ...