All Veterans were encouraged to file a copy of their discharge papers (DD214) with the county they returned to to live, Some counties filed them with the recorders office, some the Clerks office and even some the family court dept. Try the local Veterans Affairs Office the the county he lived in.
US Army WWII service record are stored at the NARA but be aware 80% of the service records of the time frame he was in service were burned in a fire in 1973. Also one had to be a next of kin as defined by NARA for copies. http://www.archives.gov/veterans/http://www.archives.gov/veterans/
Contact your older relatives as they may have memories or letters of the time.
You can try a do an internet search of his name in an online book archive as memoirs are being written and he may be mentioned.
Look at old newspapers of the time for announcements of service and news of the "local heroes". Was anything mentioned in his obit? Did he have Military Honors at his funeral? Contact the funeral home to see if they have information. One family has to show proof of Honorable Discharge for such Honors.