During WWII, the U.S. Army Signal Corps was divided into 11 Organizations.

Signal Construction Battalion
Signal Photographic Company
Signal Pigeon Company
Signal Radio Intelligence
Signal Photo Lab Mobile Unit
Signal Operations Battalion
Signal Operations Company
Signal Depot Company
Signal Repair Company
Signal Installation Company or
HQ Signal Service Army

During WWII, the soldiers performed these MOS jobs.

Communications.

a. Message Center.
542 Communications Chief.
560 Pidgeoneer.
667 Message Center Clerk.
674 Message Center Chief.
765 Visual Signalman.
805 Cryptographic Technician.
807 Cryptographic Code Compiler.
808 Cryptanalysis Technician.

b. Telephone and Telegraph
039 Cable Splicer, Telephone and Telegraph.
095 Central Office Repairman.
097 Installer-Repairman, Telephone and Telegraph.
115 Automatic Telephone System Maintenance Man.
187 Repeaterman. Telephone.
197 Submarine Cable Station Technician.
209 Submarine Cable Station Operator.
232 Switchboard Installer-Repairman. Manual
236 Telegraph Operator.
237 Teletype Operator.
238 Lineman, Telephone and Telegraph.
239 Teletype Mechanic.
261 Wire Chief. Telephone and Telegraph.
309 Telephone Operator.
384 Installer, Toll Telephone and Telegraph.
641 Field Lineman.
650 Telephone Switchboard Operator.
801 Cryptographic Repairman (Designated Equipment).
893 Facsimile Operator.
894 Facsimile Technician.
950 Wire Repairman. VHF.

c. Radio and Radar Operation.
514 Radar Crewman (Designated Set).
740 Radio Operator, Intermediate Speed.
756 Radio Operator. AAF.
759 Radio Operator, CKS.
760 Radio Operator, AACS.
766 Radio Operator. High Speed, Manual.
776 Radio Operator, Low Speed.
777 Radio Operator. High Speed. Automatic.
798 Transmitter Attendant. Fixed Station.
799 Intercept Operator. Fixed Station.
842 Radar Operator, AN/TPQ (Designated Model).
843 Radar Operator, AN/TPT (Designated Model).
866 Radar Observer. Sea Search.
869 DF Evaluator.
1766 Radio Operator, AN/MRQ (Designated Model).

d. Photography Equipment Repair.
042 Camera Repairman.
158 Microfilm Equipment Repairman.
206 Sound Projector Repairman.
207 Sound Recording Equipment Maintenance Man.
943. Camera Technician.

e. Photography.
043 Cameraman, Motion Picture.
130 Animation Artist.
131 Film Editor, Motion Picture.
132 Electrician, Motion Picture.
137 Projectionist, Motion Picture.
152 Photographer.
208 Sound Recorder, Motion Picture.
285 Cameraman, Animated Motion Picture.
286 Motion Picture Production Technician.
287 Sound Editor, Motion Picture.
407 Sound Mixer, Motion Picture.
415 Electrician, Sound Transmission.
449 Process Background Supervisor.

f. Photographic Laboratory.
016 Laboratory Technician, V-mail or Microfilm.
028 Blueprinter or Photostat Operator.
107 Photolithographer.
134 Laboratory Technician, Motion Picture.
945 Photographic Laboratory Technician.

THIS IS NOT A GOVERNMENT SITE. IT IS JUST MY WAY SAYING THANK YOU TO ALL THE BRAVE MEN AND WOMEN OF THE U.S. ARMY SIGNAL CORPS, PAST PRESENT AND FUTURE.