There are many chains of authority casually referred to as chains of command; however, my reply addresses the chain of command which descends from the Commander in Chief/President down to the local commander in the field so that an order from any commander in the chain carries the same weight as an order coming directly from the President who is elected to project the will of the people.
A chain of command is necessary to provide continuity of direction and coordination, between individuals and the organizations they comprise, in pursuit of national objectives while protecting against fallibility by holding commanders' orders to the test of Constitutionality.
Outside of the chain of command, rank versus position is another matter.
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