Lovely find Derk!
I didn't know Cab 13's ended up in Vietnam, but the ARVN did use C15TA's and also Lynx scout cars. I think I have even seen a couple of C15TA's on display in a museum in Vietnam.
edit.....of course here on MLU:
http://www.mapleleafup.net/forums/sh...ad.php?t=13686