U.S Navy Officer Ranks and Enlisted Rates
Enlisted Rates: The rating badge is a combination of rate (pay grade, as indicated by the chevrons) and rating (occupational speciality, as indicated by the symbol just above the chevrons). The rating badge is worn on the left upper sleeve of all uniforms in grades E-4 through E-6. Chief Petty Officers (E-7 through E-9) wear collar devices on their white and khaki uniforms and rating badges on their Service Dress Blues.
Officer Ranks: Navy Officers wear their rank devices in different places on their uniforms, depending upon the uniform. Khakis-pins on the collar, whites-stripes on the shoulder boards, and blues-stripes sewn on the lower sleeve. Shoulder boards are also worn on bridge coats and reefers.
Specialty Insignia: Officers in the Navy are either Line Officers or Staff Corps. Among these are also Limited Duty Officers and Commissioned Warrant Officers. Staff Corps and Commissioned Warrant Officers wear Insignia in place of the Line Officer's star.
Check out the Navy App Locker for the APP "US Military Rank & Reference" for a quick and fun way to learn all about different ranks and insignia for the entire military.