Your Dad was inducted 29 March 1941 at Detroit. He underwent basic medical training at Fort Grant, Illinois. Company A, 31st Battalion was a training organization. Captain G. L. Kress, M. C. (Medical Corps) was his company commander during his training at Grant. The photo you have is a graduation portrait of Company A. There is not, nor has their ever been, a 31st Medical Division. Medical collecting companies did just that; collected, treated and processed wounded. Graves registration units collected, processed and buried those whom the medical collecting companies could no longer help. These were two entirely different activities, performed by two entirely separate arms of service (medical units were Medical Corps; graves registration units were Quartermaster Corps). He underwent advanced training at the Medical Technician School, O'Reilly Army General Hospital, Springfield, Missouri, upon completion of which he was appointed a Surgical Technician and advanced to the rating of Technician Fifth Grade, a specialist rating eqivalent to the rank of corporal. Normandy, Northern France, etc. are the campaigns in which he participated in France (possibly Belgium) and Germany during the war. I can give you more but I'll have to access his records and that will cost.