They eliminate the bottom third of applicants by ASVAB score which would mean an IQ of 93 if it translated exactly (ADVAB to IQ and SAT is only about 0.8 correlation). That is the minimum to get in to do any job at all for a minimum enlistment contract. So to talk about statistically significant career success predictors you would have to get into the low three digits, just looking at nothing but the math of IQ distributions. A cut-line of 80 would only drop the bottom 9% of the general population.