 Enlisted Marines with paygrades of E-4 and E-5 are non-commissioned officers (NCOs) while those at E-6 and higher are Staff Noncommissioned Officers (SNCOs).The E-8 and E-9 levels each have two ranks per pay grade, each with different responsibilities.Gunnery Sergeants (E-7) indicate on their annual evaluations (called "fitness reports") their preferred promotional track