If chain of command is always followed, then the orders will be neutered before they can be carried out.

While any superior officer can circumvent subordinates, as far as I understand it, this would be highly unusual, insulting, and self-disparaging. Technically Miller himself could give the orders to specific troops to carry out, but as soon as his orders are issued, the troops commanding officer can belay those and issue their own.

There is a reason tyrants don’t like chain of command.