Lets say there was widespread unrest and domestic violence and a President needed to "call up" the militia.
What would that look like and who actually would be called up?
All gun owners within a set age range are considered in the militia IIRC.
I think if a President called up the militia he would specifically call up those who have already served in the military and/or law enforcement and would ask the rest to stand down.
It only makes sense that they would be under direct control of active military officers.
Truth be told, in all my years buzzing around the gun "community" I never really gave much thought to what a call up would look like.
That's only one scenario in which the militia might act.
The militia might act to depose Congress or the President, in which case it would self-mobilize, or mobilize based upon a collaborative effort from several Governors of individual States.
Or, in the case of a State where the Governor does not support the mobilization of the militia to depose Federal offices though several other States are doing so, the militia of that State might opt to depose their Governor, in order to wrest control of local authority and then join the Federal effort once successful.
All of these are rather organic leadership environments. You might see County Sheriffs leading portions, or veterans, or NG officers. Maybe even rogue elements of active duty armed forces. You'd probably see a bifurcation in leadership with one part being political/charismatic, and the other part being logistical/tactical.