BBM.
It may not have been a physical issue that kept him out of the army, per implications in the above.
Im sorry,have you EVER been through the selection process for the forces? I have and it is tough not only physically, but mentally. Thry actuallu grill you by a psych for an hour to see whether you are mentally stable and prepared. I failed this particular aspect of the process, so no, that is not why he was discharged.