Master Sergeant Ronald Santos, pictured here with his wife Araceli Santos, is the new interim sergeant major for the Headquarters, Army Reserve Information Operations Command (ARIOC) located here at the Adelphi Lab Center.With more than 300 Soldiers, the ARIOC is the Army Reserve's only information operations unit. It leverages information technology skills to defend our computer systems and to affect an adversary's information systems in order to gain information superiority.MSG Santos took over his new duties during a change of responsibility ceremony April 15.