When did the navy make E-9?

The United States Navy established the E-9 pay grade in 1958. This rank, known as Master Chief Petty Officer, was created to recognize senior enlisted personnel who had significant leadership responsibilities. The E-9 rank includes the Master Chief Petty Officer (MCPO), the Fleet Master Chief Petty Officer (FLTCM), and the Command Master Chief Petty Officer (CMDCM).