You may or may not be able to get his records with the info you have, Bonnie. As you will find in the directions at the NPRC site, "Requests must contain enough information to identify the record among the more than 70 million on file at NPRC (MPR).Certain basic information is needed to locate military service records.This information includes the veteran's complete name used while in service, service number, social security number, branch of service, and dates of service.Date and place of birth may also be helpful, especially if the service number is not known."
SS# for WWII vets is no doubt of little use. As you will also find in directions at the site:
"Service Number (SN).Also include the veteran's service number on a request if service was during the period when service numbers were assigned as personal identifiers.The military services discontinued using the service number as an identifier and began using the social security number on the following dates:
Branch of Service Date of Changeover Army and Air Force July 1, 1969 Navy and Marine Corps January 1, 1972 Coast Guard October 1, 1974"