hi and welcome to SR. I'm the mother of a 22yr old heroin addict. He too was in and out of treatment since he was 17 including the army. it's a long road for us and them. my son doesn't want to ever do drugs again but that damn addiction grabs at him. he drugg free now for 4 months but I will always worry. But its up to him to stop, I will help by providing phone numbers and phone numbers only and he knows this. well in telling you all this I hope you know you're not alone.
good luck and prayers to you and your family