The US Army will not take you if your IQ is below 83. In their view, no one with such intelligence can be trained to handle any job at all.
Look at the globe and see how much of the world is, essentially, hopeless.
Yep.
The Army does not give IQ test, they give the ASVAB which is an aptitude test. You might be able to estimate an IQ, but I doubt it would be accurate.