The armed services must attract, retain, and promote high-quality personnel. This monograph examines their ability to meet these goals in the past. Using the quality index, we find that those who complete their first terms, who stay until year of service (YOS) 8 or YOS12, and those who are promoted to higher grades are significantly higher quality. Our conclusions differ from those drawn from traditional measures because our measure includes information that cannot be predicted at entry but is instead revealed on the job.