The battalion S-3 assists the battalion commander in planning, preparation, conduct, and supervision of all events and  training activities of the battalion. Additionally, the S-3 keeps the commander advised on the progress of events and training. 

Specific duties of the S-3 are to:

- Prepare the weekly training schedules and post one week in advance of training on the bulletin board

- Organize events such as extracurricular activities.

- Inspect cadet training for compliance

- Maintain the training portions of cadet records in the JROTC Unit Management System (JUMS)

-Assume command of the battalion in the absence of both the battalion commander and XO