Who served as the assistant band director from 2012 to 2015?

The correct choice highlights that Mr. O'Neil Sanford served as the assistant band director from 2012 to 2015. This period is significant in the context of the band’s history, as it reflects the leadership and educational strategies he implemented during his tenure. His role would have been to support the director in managing the band, organizing rehearsals, and mentoring students, thereby contributing to the overall development and performance quality of the ensemble. This experience would have played a crucial role in shaping the band's culture and musical excellence during those years.

The other individuals listed may have had roles within the band organization, but they did not hold the position of assistant band director during that specific timeframe, which is key to understanding the contributions of leadership in a musical program.