The insigne (shoulder patch) on the right sleeve (the wearer's right) is the unit (or parent organization of the unit) he served with overseas. The division's veterans association may be able to assist. To save time, here's the addresses of both.
94th Infantry Division Association 609 Dogwood Drive Downingtown, PA 19335-3907
102d Infantry Division Association 211 Reynard Road Bridgewater, New Jersey 08807-1118