Are you purposefully not mentioning the IQ cutoffs the military uses for soldiers. it has been as high as the 50th percentile for the air force.
In the Army for example, the highest ASVAB averages are held by infantry & special forces (which is ironic given the low ASVAB requirements for infantry). Many people join the infantry for 4 years only, as a part of a “See action, travel, shoot guns” post highschool before college mindset.