my first post here, long time follower havent seen anyone figure out how to load and unload units in armies. Think ive got it figured out. Make armies upgradable to another army type a unit (i used medieval army, lack of creativity)with same shields and everything else expect prerequisite of military tradition with ZERO transport slots and flagged the "medieval army" with ARMY,LEADER, AND BUILD ARMY. When the army is upgraded to medieval army it has no transport ability so the units get kicked out, and the new unit can then produce a new army. I apologize in advance if someone figured this out long ago, ive just never seen it.