What is the Navy rank for E9?

The rank of E9 in the Navy is designated as the Master Chief Petty Officer of the Navy. This rank represents the highest enlisted position in the Navy and is held by a single individual who serves as the senior enlisted advisor to the Chief of Naval Operations. The Master Chief Petty Officer of the Navy plays a crucial role in providing visibility and insight into enlisted matters, policies, and morale within the Navy, making it a unique and significant rank.

While Senior Chief Petty Officer and Chief Petty Officer are also E9 ranks, they serve under the Master Chief Petty Officer of the Navy in the enlisted hierarchy. The Master Chief Petty Officer rank itself reflects considerable experience and leadership within the enlisted ranks, but it does not carry the universal representative and advisory responsibilities that the Master Chief Petty Officer of the Navy does.