The Marine Corps does not separate E-6 from E-7 as their Navy counterparts do, why does the Navy separate Chiefs from junior enlisted?

A. Across the services, the rank structure begins at E-1 and progresses to E-9 for enlisted members; and begins at O-1 and progresses to O-10 for officers. When members enter military service, they assume the rank at the beginning of their ladder.

As service members gain more experience and prove that they meet the standards of their current rank and show potential to be successful at the subsequent rank; they are promoted and inherit additional responsibility. The responsibilities placed upon each rank vary from service to service. However, all military services distinguish between junior enlisted and senior enlisted personnel at some point.

In the Marine Corps the transition occurs between E-5 to E-6; in the Navy, that transition occurs between E-6 to E-7. More.

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