The 45th Reconnaissance Troop was an element of 45th Infantry Division. The 45th Division was, in turn, an element of VI Army Corps. VI Corps was pulled out of the line in Italy and spearheaded the Invasion of Southern France. Fought in France and Germany from then on out.
He apparently arrived too late to participate in the Anzio Campaign. Send me a copy of the papers you have and I'll "decipher" them for you. If you don't have a scanner, I'll send you my physical address.