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If you want the 13th Singal Battalion the Markings would be looking at the vehicle front reading left to right (passinger side to drivers side) 1CAV 13S HQ-1 or 1CAV 13S A-10. You would need to decide if you wanted it to be Battalion HQ or HHQ (Head Quarters Head Quarters Company...
http://victoralvarez.jalbum.net/Vietnam%20Photos%20Album%20two/slides/545th%20MP%20Jeep%20-%20X-17%20Unk%20Passenger.html
That is a pic I found doing a search on Yahoo for vietnam jeep 1st Cav 545 MP Company. A quick web search shows that the 545th served in Vietnam and is still active today...