He is listed in the Nat'l Archives as John W. McVitty; Private First Class; Hometown, Hardin County, Ohio; Serial Number 35270625. You can try to get his service record from the NARA. Info on how to do so can be found at this website:
You can request his Individual Deceased Personnel File (IDPF) from this resource:
US Total Army Personnel Command Att: TAPC-PAO (FOIA) 200 Stovall Street Alexandria, VA 2232-0404 (As well as giving them name, rank, serial number, unit, etc, be sure to cite the Freedom of Information Act in your request.)
You can try the 1st Armored Div vet assn. They might have something on him. Their web address is: http://www.1st-armored-div.org/http://www.1st-armored-div.org/
Further, there might be something available in Hardin County, Ohio (historical society, vet organizations, etc) that could help you.