While doing genealogy on my relative, a WWII picture shows that he is standing next to a sign that reads exactly 638TH R.C. 2ND PLAT. 3RD SQD He was in the Pacific Theater. Does this convey what unit he was in or tell me where he was, or any information that I could pursue to a deeper level?
It's the 3d Squad, 2d Platoon, 638th Reception Center. A Reception Center (also recp cen) was a place at which recruits and newly inducted personnel were examined, classified, equipped, immunized, and forwarded to their assigned organizations.