At that time, everyone in the Army was given something similar to a traditional IQ test with added questions about spatial reasoning. From your score you were place in a in bucket of I-V, I being the top and a good candidate for technical or officer training. V being the lowest which meant a job as a laborer, cook, and the like. Of course the army collected the stats and for whites you had a normal distribution, a third in group III and another third for each the top and bottom groups. For blacks, almost half of them were in Group V which would put them in the 70 IQ range!