OK, same thing still applies. If you ggogle "79th infantry division 315th regiment" , you get lots of hits.
www.libertyroad.com/ww2usvets/79th/page5.html http://www.army.mil/CMH-pg/lineage/b...gt/0315rgt.htm
These show the area of conflict in WW2. As it so happens it is quite close to me. I live in the channel islands about 40 miles from Cherbourg and Brittany. I would still be inclined to start with Dept of Defence, they are bound to have a public relations dept that will assist you in locating surviving members.
Must be getting thin on the ground now though
Try this chap: http://www.military.com/HomePage/UnitPageBulletinBoard/1,13492,100050|774937|M,00.html