Paul,
God Bless and Good Luck to your son. Once he gets in-country, I'll let you know how to sign up for a daily 4th ID update that one of our 1-22 Vietnam Vets puts out. He spends about 4-6 hours a day searching the Internet for articles about the 4th and all their attached units so you don't have to do it yourself.
By the way, I'm still waiting for your picture of Gator 137 so I can give it to Pat Kelly.
George