Petty officer third class is the fourth enlisted rank in the U.S. Navy, U.S. Coast Guard, and the United States Naval Sea Cadet Corps, above seaman and below petty officer second class, and is the lowest rank of non-commissioned officer, equivalent to a corporal in the U.S. Army and Marine Corps.Click to see full answer. Hereof, how much does an e4 make in the Navy? Navy Petty Officer Third Class Pay A Petty Officer Third Class is a noncommissioned officer in the United States Navy at DoD paygrade E-4. A Petty Officer Third Class receives a monthly basic pay salary starting at $2,139 per month, with raises up to $2,597 per month once they have served for over 6 years.Secondly, how long can you be an e4 in the Navy? The new limits raise the maximum number of years petty officers can stay on active duty in paygrades E-4 through E-6 by two years for each rank. E-4 will increase to 10 years from 8 years. Also, what rank is e4 in the Navy? Navy Ranks – Enlisted and Officer, from Lowest to Highest Pay Grade Rank Abbreviation E-2 Seaman Apprentice SA E-3 Seaman SN E-4 Petty Officer Third Class PO3 E-5 Petty Officer Second Class PO2 Is an e4 in the Navy an NCO?E-4 to E-6 are non-commissioned officers (NCOs), and are specifically called petty officers in the Navy. Petty officers perform not only the duties of their specific career field but also serve as leaders to junior enlisted personnel.