I've just begun to help the family look for his records. From a collection of photos, it seems that Corporal Harold Dempsey Piper served in Italy and was a member of the 15th Air Force. Among the photos are in-flight photos of B-24 bombers with tail markings of the 449th Bomb Group(Heavy).
The family is still searching for details of his service such as unit within the bomb group and his duties. It is possible he was a crewmember but there is nothing to indicate this except the photos in his collection