I have already found these particular ranks, but now I do not remember where.
Confederate Naval Cadet, wore the uniform prescribed for 'midshipman' and 'passed midshipman'. In the school ship the cadets were gathered in teams and one for group was designated 'officer, this cadet wore a badge that distinguished him from the others, but the regulation does not specify it. As the badge passed from cadet to cadet, it was probably an armband or a sash.