Trying to identify a South Vietnamese "KT" helmet

[Signal_Corps]

Sorry for the cross post: I posted this at USMilitariaForum.com but never received a reply.

 

I'm trying to identify the unit for the "KT" helmet worn by the South Vietnamese soldier in this photo, circa 1968. There are no visible unit markings on the M37 Dodge that they are loading. The photo was shot at a remote airfield and I believe the supplies were being loaded to be taken to CIDG troops at a 5th SFG A Team camp near the Cambodian border. Thanks!