113-185 is listed as a "Truck, Utility, 1/4 Ton, GS"
In the comments box it has "Vic. Archive Pic, Vietnam 17 Construction Sqn, Vietnam, 13.03.1969. 19292 Miles. 2A Condition."
It looked like it had a scoop on the top of the cab until I realised it was to open bonnet poking up.
The hardtop sitting outside might be off it.
With the antenna on the back, that thing in the middle would have to be a radio. Odd shape though.