Suzanne, I'm a hobbyist, not an expert, but in that capacity I'll offer a couple of thoughts. "207 INF" would seem to indicate 207th Infantry. (In the Army an infantry regiment is typically referred to as an "infantry". For instance, during WWII the 16th Infantry Regiment, one of the infantry regiments in the 1st Infantry Division, would have been referred to as the 16th Infantry.) My reference's indicate there was no 207th Infantry existing in the US Army during WWII. Are you sure of the designation on his stone? Could it be "201 INF", perhaps "20th INF", or other? Incidentally, if the listed cause of death was correct, the story about him throwing himself on a grenade was probably apocryphal (unless it was during training, and not in combat). "DNB" stands for "Died - Non Battle", and indicated death cause by disease, accident, etc.