"The 3217th Serv Corp must have been part of the 29th." The 3217th Signal Service Battalion may have been attached to the 29th ID at some time, Shirley, but it was not a part of it. An infantry division was a distinct organization, with well-defined "organic" elements which comprised it. In addition, other units would be "attached" to it, from time to time, for support, where necessary. Where his record says he was in L Company, 175th Infantry, I think it's unlikely that his service with the two units (3217th and 29th ID) coincided. The 29th ID had a signal company (the 29th Signal Co.) but L Company was an infantry company (also called a rifle company) comprised, primarily, of trigger pullers. If he was in L Company, 175th Infantry, I'm quite sure that it would not have been as "a part" of the 3217th. Given his MOS, and the medic's notes that he was wounded by mortar fire while on a walkie-talkie, it seems likely that he was communications personnel of some sort. Unfortunately, I am not well-enough informed to tell you exactly how his work with the communications equip would have been incorporated into the TO of a rifle company.