Hello, Mary. From your post it's a little difficult to tell exactly what you are seeking (his unit, operations he was involved in, men who served with him?). I am only a hobbyist, not an expert, but assuming you would like to answer one or all of these questions, I'll offer this until you find more informed aid.
With such limited info your chances of success are not good. Your first step in search of anything meaningful is usually to establish his unit to the lowest level possible. To that end, you should be able to get his personnel record from NPRC, info about which can be found at this web page:
To do so you may need information in addition to his name and branch of service (such as his serial number). Some other resources to pursue in that regard:
If he ever applied for benefits, you can contact the Dept of Veterans Affairs to see if they have info that could help you. The national number is 1-800-827-1000. Also, you may have a "nearest DVA regional office" in your area. The VA web address, with other info, plus a list of facilities, is http://www.va.govhttp://www.va.gov
Check for a recorded discharge at the county courthouse where he resided at the time of he left the military. It was not unusual for WWII vets to record their discharges.
Other possible sources include: 1. Veteran's organizations (e.g. American Legion) of which he may have been a member at his place of residence after the war. 2. State Historical Records Office (of state where vet resided at time of entry into service). Ask them to check service record cards, bonus records, and Reports of Separation that the state may maintain. Internet listing of state historical record coordinators: http://www.archives.gov/nhprc/about/state-coordinators-boards.htmlhttp://www.archives.gov/nhprc/about/state-coordinators-boards.html 3. U.S. Civil Service Commission, Bureau of Retirement and Insurance (if retired from federal employment) 4. Any employer to whom a record of military service was furnished. 5. State Adjutants General (if any service was performed in the National Guard). 6. Social Security Administration (if a claim for old age, survivor's, or disability insurance benefits has been filed and the service involved was from 7 Sept 39 to the present). 7. Railroad Retirement Board (if a claim for railroad retirement or survivor's benefits was filed). 8. Hometown newspaper archives which might have stories about his service or homecoming.
Some of these are resources I have used researching my own family, others are those I have only read about, or found online. Please verify all to your own satisfaction, or seek professional assistance.