Which person was not listed as an assistant band director during the years specified?

The correct answer is based on the documented history of the band program, which typically includes listings of personnel who played significant roles during specific time periods. Dr. Justin Sherrod, although likely involved in the music department or band activities at some point, was not recognized as an assistant band director during the specified years.

The roles of assistant band directors are often well-recorded due to their importance in supporting the main director and contributing to the band's success. The other individuals mentioned have been acknowledged for their contributions in the listed capacity, indicating their active involvement during that time frame, which is why they are associated with the position in historical records. This context helps highlight Dr. Sherrod's absence from the assistant band director role during the specified years, confirming his non-involvement in that position at that time.