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    Note that AFQT is the actual SAT-like part of ASVAB, so the part most likely correlated with IQ. See psychology.stackexchange.com/questions/20220/… Commented Sep 25, 2019 at 4:31
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    I understand why you avoid (3), but it's worth noting that it's almost certain incorrect. Measuring intelligence in general is very difficult and plenty of people think IQ is not a good measure (especially in regards to intelligence required for warfare!). The use of IQ is almost certainly due to the ease it in which it can be measured.
    – Cliff AB
    Commented Sep 26, 2019 at 3:41
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    @CliffAB No matter how bad a measure IQ is on the individual level, if all you're worried about is how the troops are going to perform, you only need IQ to be a reasonably useful statistical predictor. I always thought that it was.
    – sgf
    Commented Sep 26, 2019 at 8:36
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    @sgf: In regards to (3), my point was the (3) is a statement on the individual level ("because their experience has shown that anyone with an IQ under 83 will be more of a liability than an asset to the military"), rather than the population level, hence why it's almost certainly wrong.
    – Cliff AB
    Commented Sep 26, 2019 at 14:25
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    @CliffAB It sounds like you are trying to write an unreferenced answer in the comments. Commented Sep 27, 2019 at 17:28