Strengthening the human capital of National Police members in the Sub-division unit is a crucial element in improving the quality of complaint services and at the same time creating an institutional competitive advantage. This study aims to analyze how the development of competence, integrity, and professionalism of members of the National Police who serve in Sub-divisions contributes to the effectiveness of complaint services and supports the development of the Islamic community in Bandar Lampung City. Using a qualitative approach with a case study design, data was obtained through in-depth interviews, observations, and document review related to the work mechanism of the Subdivision. The results of the study show that strengthening human capital which includes improving communication skills, emotional intelligence, sensitivity to socio-religious values, understanding of professional ethics, and report analysis skills significantly improves the responsiveness, transparency, and accountability of complaint services. This improvement in the quality of services has a direct impact on the growth of public trust, which further strengthens participation and social cohesion in Islamic society. Thus, Subbagyanduan not only functions as a complaint handling center, but also as a strategic instrument in building a harmonious relationship between the National Police and the community. This research emphasizes that strengthening human capital in Sub-divisions is a key strategy in building the competitive advantage of the National Police and encouraging the development of Islamic society through humane, inclusive, and equitable public services.