Hi..
Have you tried the National Archives for regimental unit records that would include Co. B? Sometimes you can find BN records too..so you would want 1st BN. You can also inquire if the Records Center in St. Louis might have Company Morning Reports that would show the flow of men into and out of the Company.
As far as living members are concerned, the search is more difficult and hit and miss. If you have any WWII era addresses, you can begin by checking with local postmasters at those addresses. I suspect you have already tried any historical associations. Have you tried putting a notice in the American Legion, DAV or VFW magazines?
If you want additional information about Company B men, many States offer discharge records at a small price. These records are either held in the county of WWII residence OR by a State Archive in the State of WWII residence.
Not sure any of this helps, but hope that it does. I tried most of these steps searching for members of my father's unit...but this was starting in the 1970's. And I have followed the same practice using merchant marine records in my search for crews and passengers on board a particular freighter during the war.
theron