I'm not sure if "discharged" is what's happening. Has he sworn in and shipped?
As I mentioned before, essentially the same thing happened to my brother in law (twice) and he eventually shipped.
What I didn't mention is that he didn't make it through Marine Corps boot camp. He eventually made it through navy boot camp, but didn't successfully complete his enlistment.
He swore in last July and was scheduled to ship this month but dislocated his shoulder in May. I guess there could be other stuff going on that I don't know-who knows! So do we just wait for the letter to see if he's R4 or whatever? Is a reinlist off the table? Can he still enlist in another branch of service? My nephew is talking hard to him about Army-he ships in a couple of weeks. I still think this feels like a really bad dream.
Each time one of his "catastrophes" befell him, I got about 20% of the story from him. After some research into these occurrences, I always found the other 80%.
I don't know your boy from Adam, but I'd be willing to bet there's more to the story.
If he's fit and motivated, he'll ship. Be patient and find out the rest of the story.
Best of luck to you.