Putting Leaders in charge of Army command is a troublesome operation with VP and NM points to be paid for any time a senior leader is passed over.
Now, it happens player needs to transfer an Army Commander to take charge of command of a different Army: in other work two Army Leader will switch respective Army commands.
To do that an Army Leader is to be dismissed from first Army command to be moved to the Ledership of the Second Army. Although Leaders are anyway in charge of an Army command, although a different Army, the high dismission costs are to be payed for.
Note dismission costs are charged for both envolved leaders.
Guess in the example I reported, Command dismission costs should not be payed, beeing the two Commanders not fired off but just exchanging their commads.