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You might want to ask the Guys over at the G838 Forum, or maybe search their Forum as I'm sure your question has been asked.
http://g838.org/index.php
Here's some history on the 13th Signal Batallion:
13th Signal Battalion - Historical Missions
I don't believe there were any paticular markings designating a radio Jeep. All the Army branches (Infantry, Cavalry, Artillery, Armor, Transportation, etc), had radio Jeeps. Most Jeeps had radio mounts installed and the radios (524's) could be moved from vehicle to vehicle, but no special...