Can I change the army-slot buffs? : rwarcraftrumble

army slotMoore, GA will receive a slot to Pathfinder School. Applicable waivers must be submitted, if required. Soldiers who graduate the Ranger course at Fort Moore, GA will be givenI can't summon it using undead army? as in the 4th slot to add it is locked out. I can't find anything on the that points me in the rht direction.