a Based on the Department of Defense (DoD) occupational conversion index. DoD numerical designator appears in parentheses.
b As of the end of September of each year.
SOURCE: Derived from special tabulations provided by the Defense Manpower Data Center.
by more refined (two-digit) occupational categories. As Table 6.9 shows, close to one-quarter of personnel (over 15,000 soldiers) with infantry training were serving in a noninfantry occupational category during 1997; this type of mismatch was also found for nearly 80 percent of personnel trained in clerical skills.
It is not clear why these mismatches occur. A study of detailed occupational categories suggested that the primary-duty mismatches were prevalent in occupational categories that are associated with specific weapon systems—perhaps indicating that some migration may have occurred when a weapon system was scaled back or eliminated. Another possible explanation could be that the Army of the late 1990s is providing more flexibility to personnel who may wish to migrate from one occupation to an-