This research aims to test the Perceived Organizational Support and Proactive Personality effect on Prosocial Motivation and their impact on the Affective Commitment of the Aceh Education Service. The population in this research was all civil servant employees of the Aceh Education Service in 2022, totaling 307 people. The number of samples was 173 employees. Data were processed using the Structural Equation Modeling (SEM) and Sobel test. The research results show that Perceived Organizational Support and Proactive Personality influence Prosocial Motivation, Perceived Support, Proactive Personality, and Prosocial Motivation influence Affective Commitment, and Prosocial Motivation mediates the Perceived Support and Proactive Personality’s impact on Affective Commitment. Prosocial motivation was also shown to be a partial mediator in the model. These results explain the support for the old theory which was integrated into a model of strengthening affective commitment, where this finding becomes the premise that strengthening can occur as a result of the role of perceived organizational support and proactive personality, as well as prosocial motivation. These findings reconstruct previous academic models and can be used to develop theory and best practices in the future.