I find that the more students I have on the leadership team, the more ownership the students have:

Drum Majors

Guard Captain
Guard Squad Leaders

Drum Captain
Drum Squad Leaders

Section Leaders
Squad Leaders in every section

9th/10th Grade Presidents

Field Commanders

Librarians

Social Officers

Social Media Team

Equipment Managers

Secretary

At-Large

The Super 7:
5 drum majors, drum captain, and guard captain


Then we also have apprentices - discussed after the season starts and designed to give responsibility to future potential leadership members. They help with setting up the voice machine, drum major stands, emergency cart, etc...