I want to find out info on my father's service records

I don't have  his service # but I have info. His Name was Roland Jefferson Garrett he was born December 5, 1921. He served under Patton and was injured in Normandy and sent to Utah.  Brigham City to rehab.. I would welcome any info. But I really want to know about his company number and where he was and where he fought in WWII. When he was injured and when he left to come home. I remember seeing a post card to my mother from Paris. I'm pretty sure he was at Normandy. Thank you in advance!