OK. So going through OOB for 3rd ID: a battalion of the 30th IR (battalion unknown to me now but I do have a 30th unit history, and not aware of another outfit landing in this small operation) chased retreating enemy in a successful landing at Capo d'Orlando 10 Aug. 1943. Obviously this Division and all elements finished their work in Germany with the 30th completing their mission in Austria. You could certainly start with the address of the attic it came from to get info on the vet (as a starting point). Keep in mind the 3rd ID had 25k casualties during the war, lot of guys weren't hurt. Big Division. Needle in a haystack, but a man who participated in Sicily would likely have a NOK tag, which means researchable, back to address of helmet find. Good luck