JACK A. Coston - Served with 442 RCT during WWII - Marysville, GA or D.C.

I am working on a roster of all the men that served with the 442nd RCT, that is the mostly Japanese-American unit that distinguished itself so very highly during WWII. The man I am looking for, Jack A. Coston was an Officer, a Capt. in fact, at least at the end of the war. I would like to send him or his family a form letter and verify his ASN and hometown. Unfortunately I have no idea what part of the country he could be in. He enlisted from either Marysville Co, GA or the D.C. area but he could have moved anywhere after the war.
He would be between 79 and his early 90's by now, and if anyone can help me locate him I would appreciate it very much. You can see my email addy here and my phone no. is 714-995-0583.
Thank you very much for your interest.
There is a web site you can go to and see the progress of this work < www.ajawarvets.com >