How do I get in contact with FRG?

My husband deployed recently. He's been able to call me a couple of times and says that he can't get anyone to give him any information on a mailing address so I can send him things. They are moving out from where they are now and he won't be able to contact me again. He's asked me to contact FRG, but I don't know how to contact them. Before he left, two people from FRG told him they would contact me over 30 days ago but I've never heard from them. I live six hours from base so I can't exactly just hop over there. I tried going to www.armyfrg.org but I don't know what his unit number is (bad, I know). What on earth do I do to get in contact with FRG?