Well, I will give an actual example of non specific country that was invaded two year ago.
First profi army becomes senior force, that trains whomever wants to hold a gun (second army). There is never political support to draft third army (like everyone). Remains of first army flee after government collapses. Political regime changes.
First profi army becomes senior force, that trains whomever wants to hold a gun (second army). There is never political support to draft third army (like everyone). Remains of first army flee after government collapses. Political regime changes.