United States Army /repositories/4/archival_objects/1400679 1 box 1942-1948 Air Forces /repositories/4/archival_objects/1402669 1 folder 1942-1945 18 7 Engineers /repositories/4/archival_objects/1402670 1 folder 1947-1948 18 8 Philadelphia Signal Depot /repositories/4/archival_objects/1402671 1 folder 1942 18 9