What is the sleeve device for an E-6 in the Navy?

The sleeve device for an E-6 in the Navy is indeed characterized by an eagle and specialty mark situated above three chevrons. This insignia indicates the rank of Petty Officer First Class, which falls under the E-6 pay grade in the Navy's enlisted ranks. The eagle symbolizes authority and leadership, while the specific specialty mark indicates the sailor's rating or area of expertise within the Navy, showcasing their qualifications and skills.

The three chevrons signify the level of experience and rank progression that comes with being a Petty Officer First Class. This combination of elements on the uniform sleeve distinctly represents both the rank and the specific role of the sailor, making it a crucial aspect of Navy customs and recognition for enlisted personnel.