Rate Insignia of Navy Enlisted Personnel

The use of the word "rank" for Navy enlisted personnel is incorrect. The term is "rate." The rating badge — a combination of rate (pay grade) and rating (specialty) is worn on the left upper sleeve of all uniforms in grades E-4 through E-6. E-1 through E-3 have color coded group rate marks based upon their occupational field. Group rate marks for E-1 (optional) through E-3 are worn on dress uniforms only. Chief Petty Officers (E-7 through E-9) wear collar devices on their white and khaki uniforms, and rate badges on their Service Dress Blues.
Pay Grade Rate Abbreviation Upper Sleeve Collar and Cap
E-1 Seaman Recruit SR none
E-2 Seaman Apprentice SA none
E-3 Seaman SN none
E-4 Petty Officer
Third Class		 PO3
E-5 Petty Officer
Second Class		 PO2
E-6 Petty Officer
First Class		 PO1
E-7 Chief Petty Officer CPO
E-8 Senior Chief 
Petty Officer		 SCPO
E-9 Master Chief 
Petty Officer		 MCPO
E-9 Master Chief 
Petty Officer
of the Navy		 MCPON