Army Drill and Ceremony?

When filling out of formation, the platoon leader will usually face the formation so that they are facing the direction of the 4 squad leaders, and give them a "File from the left/right!" to which the left/right squad leader will respond and step off when the leader says "March!"

o o o oo o o o    /\o o o o     lo o o o      lo o o o      facing, and filling out this way.o o o o o o o oo o o oo o o o what I want to know, is; can the leader, face the formation so that the squad leaders are on the side of the formation rather then in front, and file them out.o o o o o o o o o    /\o o o o o o o o o     lo o o o o o o o o     lo o o o o o o o o    Facing and filling out this way.I want to know if this is allowed by proper Army Drill and Ceremony guidelines, and where to find the proof that it is allowed.