Lt. Colonel Joesiah Mazzio is the Chief of Staff and the Colonel's primary staff officer. In this role, he is responsible for directing, coordinating, supervising, and training the staff. He is the only staff officer who also has command authority.

Among his numerous responsibilities, Lt. Colonel Mazzio oversees the operational cycle of the department, ensuring the effective execution of command responsibilities as directed by the Colonel. In the Colonels's absence, he ensures that the Colonel is kept informed of current and developing situations, maintaining seamless continuity in leadership and decision-making.