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The photo on the right is of a G506 Chevrolet 1-1/2 ton 4x4 commonly known in Australia as a Yankee Joe
These were a standardised US Army vehicle built in substantial numbers and an interesting mix of GMC and Chev components. They were powered by a 235 cubic inch splash feed engine coupled to the common Chev four speed box of the time and a company produced two speed transfer case peculiar to the vehicle.
Very few were used by the Australian forces as this class of truck was nearly all made up of CMPs so not common here. Most that have come to light seem to have been earth borer/pole setters and I don't personally know of one in Australia that has the original distinctive cargo body as in this photo. Note the unusually wide side sill.
There was still 18 months before wars end when the photo was taken and the truck is already looking somewhat dilapidated and doing heavy work. What chance of survival for this one?
Windscreen wise, the Yankee Joe was the same as the GMC CCKW 6x6 hard cab. It used external hinges and had no centre support. Instead they had a slider at each end running on a bolt attached to the door pillar and a wing-nut or knurled nut to clamp them similar to the way a Jeep windscreen works.
The L/L trucks stayed with the civilian type internal concealed hinges and centrally positioned winder right the way through so far as I am aware.
David