The largest effort to validate the ASVAB came in the form of the Joint-Service Job Performance Measurement Project (JPM). In the late 1970s, Congress became concerned that a good deal of time and money were being spent on trying to enlist high quality recruits (determined in part by ASVAB scores) without substantial evidence of a strong relationship between performance on the ASVAB and subsequent performance in military service. In response to their mandate to investigate this issue, the Army took the major role by initiating what became known as Project A. This massive undertaking involved developing hands-on and other performance tests and administering them to Soldiers at various times in their careers. Administrative data, such as performance ratings and awards and citations, were also collected and amassed into the largest database of its kind ever assembled. Much of this work is summarized in the volume Exploring the Limits of Personnel Selection and Classification (Campbell & Knapp, 2001).
In short, the research demonstrated that performance on the ASVAB did predict subsequent military performance, not just in training but throughout a Soldier’s career. For instance, researchers found that the correlation between ASVAB composites and Core Technical Proficiency (as measured by hands-on and job-knowledge tests) was .69 for Soldiers in their second tour of duty.