From: the Netherlands
Without getting into details, one of the benefits of having units in a chain of command (corps, army, army group for example) is that it adds (granted, it depends on quality of leadership) chances to pass checks (admin, initiative etc.).
"It happened, therefore it can happen again: this is the core of what we have to say. It can happen, and it can happen everywhere.”
¯ Primo Levi, writer, holocaust survivor