my grandfather Henry M Barry was in the army on his obit it says he was in the 13th infantry. What does that mean? i know he left Boston harbor on July 1 1942. how can i find out what regiment or other people he served with? i know he was in Germany when he was wounded. he also had stated something about the roer river. I havent been able to find out anything on the 13th infantry. i also have this rank it says E04 and specialty say 0095B20 does anyone know what that means?