Home » Gun Information » Gun Glossary | Gun Terminology » Range Officer (RO) Range Officer (RO)A Range Officer (RO) is the supervisory personnel responsible for ensuring that all gun safety rules are followed at a shooting range (firing range).See Also: Range Conducting Officer, Range Master, Range Safety Officer. Share:Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window)