[gordon]

In Fred Crismon's excellent "US Military Wheeled Vehicles" book is the cab on a Federal model 75-131 which is a 1.5 ton truck but obviously a lot lighter than the photo. Not a crew cab.

It matches the full profile of the front fender (note how the lower front edge of the fender is squarish - most others are well-rounded) the horizontal split of the hood line, and even the square front bumper style.

There is an even more similar crew cab on the federal 75K131 searchlight truck but that has bigger cage type wheels despite being just a 3 ton rating.