Can you help me, Please?

[SweetSue]

I am looking for someone I wrote to back in 1969. I was 14:
Cpl Fred Grande
US56843600
71st 7th Stu BN TCB
Ft. Benning Georgia
2nd
31905 USA
Fred may have been a shortened version of Alfred or something else.
I know he was married.. wife's name is Virginia Sue. At that time anyways. Unless of course he is longer with her. They were expecting a baby sometime in Sept/0ct 1969.
I have no idea what the numbers and letters stand for. Nor what type of service he was in. I am sure if I knew that, my search would be a smidge easier! I can find nothing on 71st 7th Stu BN TCB 2nd. Maybe it has been deactivated and is now something else?????
I DO know that the US # is his service number at that time. I have checked the Virtual Wall and also cannot find him on any KIA/MIA lists at all.
Why do I want to find this fellow? I am not sure. Nostalgia maybe. He was a very nice young man who listened to the childish rambling of a 14 year old girl I would like to make sure he is ok and tell him welcome home.
I have a nephew serving in the Canadian Navy in Bosnia at the moment and also, 2 of my sons are in the Air Cadet program here. They love it! So do I !!!!!
If anyone has any ideas, hints or can decifer what that address mean, please email me.
Hoping you can help
Susan