You can call the red cross they would know. It doesn't take them very long to get their mailing address. I was there for less than a day and was able to call home and tell my family my address.
You should be able to contact the red cross. They would be able to find him. Its been a while though So I don't really remember. I think that's how its done though. You'd just need his name and what fort he went to. I think. Good luck.
I think you called red cross or his base. I don't remember, I have to reread all of the information they gave me when my husband went in for basic training.
That's what I thought! Just making sure, thanks guys :)