Back in the late sixties the Army had a program “Project Ten Thousand” or some such thing which LBJ had pushed - it took a bunch of recruits who had barely failed the Army classification (IQ) test and brought them into the service on the theory that with a bit of special training they could still make effective troopers - trouble was a lot of them had what we would now call ADD or the like, which made it difficult for many of them to learn what they were being instructed in - interestingly, along with ADD often go special problems with directionality and spatial orientation, so that lots and lots of these recruits had particular problems with drilling, doing left-faces instead of right and all the rest - long story short many many of them ended up as disciplinary cases beyond being just unable to learn the required military skills, the Army spent big bucks evaluating and separating probably most of them as being unfit for service, and most of these have probably carried undesirable discharges on their records for the rest of their lives.....
Past is prologue.....
My cousin was one. He’s legally retarded.