My father was initially in the 36th Infantry Division, 36th Quartermaster Company, signals section but was not allowed to go with the division overseas due to medical reason and was reassigned to the headquarters 6th Army with the communications section at the rank of Captain. He was medically discharged at the end of the war. Two uncles were in the US Navy, one served on the USS Lexington (Essex class) as a gunner's mate on a 40mm mount. The other I don't have details on his service.
Another Uncle was in the Army. He became a career officer retiring at the rank of Colonel. Again, his WW 2 service is not known exactly to me.