As volunteers, reserve officers assist police officers by performing a variety of policing activities. This study contributes to the empirical literature on reserve officers by using data from a cross-sectional survey of reserve officers working in a Midwestern State.1 A structural symbolic interactionist model that explains police reserve officers’ self-role merger and role performances is developed and tested. Results from hypothesis testing found social embeddedness and reflected appraisals are moderately associated with self-role merger. Self-role merger is moderately associated with the number of hours volunteered per month and with the extent reserve officers seek reserve-related information, skills, and certificates. Theoretical and practical implications are also provided.