Back during WWII, my dad ran away from home and and enlisted 2 times before he was old enough to (he lied about his age). Both times he was kicked out. The third time he finally talked his parents into signing him in at age 16. During his basic training a Drill Sergent took him out behind the barracks and beat the s**t out of him. Dad later said that it was one of the best things that ever happened to him as as it knocked some sense into him. Course this was back in the days when D.S.'s could do this and nothing would happen to them.
That's a great story about your Dad...The rules and rights of trainees have changed over they years. This kid would be a time draining cancer on the NCOs. It's better to just tear up the contract.