Is this not him?
AMERICAN BATTLE MONUMENTS COMMISSION
Walter B. Rau
Second Lieutenant, U.S. Army Air Forces
Service #
O-771968
746th Bomber Squadron, 456th Bomber Group, Heavy
Entered the Service from: Illinois
Died: 15-Aug-44
Buried at: Plot E Row 13 Grave 5
Sicily-Rome American Cemetery
Nettuno, Italy
Awards: Purple Heart
http://www.abmc.gov