Who among the following is NOT a Chief of Navy?

The Chief of Naval Engineering is not typically classified as a "Chief of Navy" in the same way the other positions are. The title "Chief of Navy" generally refers to senior leadership roles that focus on overall naval operations, personnel management, or specific areas of research and development within the Navy. The Chief of Naval Operations, for instance, is the highest-ranking officer in the Navy and is responsible for the command and operation of naval forces. Similarly, the Chief of Naval Personnel oversees personnel management and the workforce within the Navy, while the Chief of Naval Research directs scientific research and development efforts.

In contrast, the Chief of Naval Engineering, while an important role, does not carry the same level of authority as those other positions and focuses more specifically on engineering aspects rather than the broader naval command. This distinction highlights why this position does not align with the category of "Chief of Navy."