WW2 Army Service Details - European Theater

I’ve been trying to find information on my Dad’s uncle. His name was Robert Joseph Hanley though some records list him as Joseph Robert Hanley. He was from Lackawanna, NY, born Aug 19, 1923 and KIA on March 14, 1945. I found a death record on Fold 3 that shows he was with the 3rd Army but as far as I can tell, his records burned in the 1973 fire. Is there anywhere else I can search to find anything out about his service or where he died?