This book analyzes how effective the Marine Corps Tiered Evaluation System is at measuring future success, more specifically, in the form of promotions, career longevity, physical fitness level and performance evaluation averages. The analysis observes first term re-enlistees from each quality tier through their future service to observe promotions, career longevity, physical fitness level and performance evaluation averages. The analysis utilizes ordinary least squares regression and linear probability models to analyze success measure outcomes. The outcomes are compared across various tier levels to determine if the tiered evaluation system is a valid tool at predicting future success. The findings indicate the Marine Corps Tiered Evaluation System is valid at distinguishing individual quality but can be improved in many ways to better distinguish quality and aid the decision makers in the reenlistment process. These improvements include a system encompassing more tiers and re-weighting the quality score components. The USMC Tiered Evaluation System is the foundation for identifying quality Marines for retention. Improving this system will better aid stakeholders in the reenlistment process and improve overall quality and organizational effectiveness.