Step Daughter problems (need advise)

I took my step son down to the Recruiter. He went all the way thru basic training, right up to the last week and then just sat down. Refused to do anything.
They sent his *** home.
I've tried the therapist and counseling. He refused to talk. Both tried to get him to speak, he refused.
To top things off, my brother in law just told me he's been helping my step son. He's told me that after a week, he's sick of him.
I'm hoping that stress from other family members becomes a motivator.
But, I have my doubts.
I don't mean to hi-jack, but I'll let you know if anything come of it.