Personnel management in security organizations represents a critical determinant of operational effectiveness, particularly within complex multi-agency environments. This research investigates the intricate dynamics of personnel management at the Defence Intelligence Agency (DIA) in Nigeria, examining the intersection of recruitment, training, inter-agency collaboration, performance management, and retention strategies in a high-stakes security context. Employing a quantitative research design with stratified random sampling, the study surveyed 400 participants, equally comprising civilian staff and military personnel from the Nigerian Army, Navy, and Air Force. The methodology utilized semi-structured questionnaires and multiple regression analysis to explore the relationships between various personnel management practices and organizational effectiveness. The findings reveal significant insights into the challenges and opportunities within Nigeria's security sector. The research demonstrates that recruitment and selection processes, training and development programs, inter-agency collaboration, performance management, and retention strategies collectively explain 82.3% of the variance in personnel management effectiveness. Each factor demonstrated statistically significant positive correlations with overall organizational performance. Key observations include the critical importance of transparent recruitment practices, continuous professional development, effective inter-agency communication, robust performance evaluation systems, and targeted retention strategies. The study highlights the unique challenges of managing a workforce comprising both civilian and military personnel, emphasizing the need for tailored approaches that recognize the distinct motivations and requirements of different staff categories. The research contributes valuable empirical evidence to the understanding of personnel management in multi-agency security initiatives. By identifying specific mechanisms to enhance human resource practices, the study offers actionable recommendations for improving operational coordination, employee satisfaction, and ultimately, national security effectiveness.

Effective Personnel Management, Multi-Agency Initiatives, Defence Intelligence Agency

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