The Greenville Police Reserve Unit was established in 2005. The dedication and volunteer spirit of these citizen volunteers bring them to the aid of the police department, often under difficult conditions. Much of the expense of serving as a Reserve Officer is at the expense of the individual reservists.

Reserve Officers routinely receive training in a variety of law enforcement subjects, including but not limited to firearms, use of force, and traffic control, in addition they must attend a forty-hour pre-basic course before being allowed to work on the street with other officers and must complete Basic Academy Training for part-time law enforcement officers. The Reserves participate in many community events, and are an import extension to the police presence.

The operations of the reserve program are assigned to Reserve Chief, Bill Harmon.