The Nigerian Security and Civil Defence Corps (NSCDC) operate in a high-risk and volatile environment characterized by terrorism, kidnapping, and armed banditry. Optimizing workforce performance under such conditions requires more than isolated interventions. It demands a systemic understanding of how job design, resource allocation, and organizational capacity interconnect to foster resilience. While existing literature often examines job demands, productivity, or morale in isolation, there is a critical lack of integrated models that position organizational resilience (OR) as a central, mediating mechanism linking strategic job requirements (SJR), job resources (JR), and workforce productivity (WP) to ultimate workforce performance (WFP). Furthermore, there is a notable absence of quantitative indices for measuring OR within African security agencies. This study aims to bridge this gap by developing and empirically validating a comprehensive Structural Equation Model (SEM) that quantifies the relationships among SJR, JR, WP, OR, and WFP within the NSCDC. A key objective is to compute a novel OR-Index using the MinMax rescaling factor method to enable benchmarking and longitudinal evaluation. Utilizing survey data from 191 NSCDC personnel across four Southwestern Nigerian states, the study employs SEM with reflective measurement models to study these relationships. All constructs are validated through Confirmatory Factor Analysis (CFA), ensuring reliability and discriminant validity. The model tests direct, indirect (mediation), and conditional (moderation) effects, with robust Maximum Likelihood (ML) estimation used to handle minor non-normality. The analysis was conducted using Python's semopy package. The SEM results reveal a powerful, empirically supported causal chain: SJR (β = 0.48) and JR (β = 0.31) significantly enhance WP. WP, in turn, strongly influences OR (β = 0.39), which acts as the primary driver of WFP (β = 0.52). Crucially, the effect of WP on WFP is fully mediated by OR (Indirect effect = 0.20). Moreover, JR moderate the relationship between WP and OR (β_ = 0.21), meaning that the positive impact of productivity on resilience is significantly amplified when adequate resources are available. The overall model fit is excellent (CFI = 0.96,TLI = 0.95,RMSEA = 0.053). These findings provide actionable insights for NSCDC leadership, demonstrating that investing in clear strategic mandates and tangible operational resources is not merely about daily efficiency but is a strategic investment in building institutional resilience. To enhance performance, policymakers should prioritize interventions that strengthen the WP → OR pathway, such as targeted training, improved equipment, and embedding the OR-Index into performance evaluation systems. This research offers a robust, evidence-based framework for transforming security workforce management from a focus on outputs to a focus on adaptive capacity.