There you go, I've said it.
They aren't war weary anything, or cabovers. Note the tyres which are in brand new or delivery mileage condition, all the equipment (that is there) appears to be in perfect order, no damage to cab - I could go on.
Cabovers would have a noticeably different cab, inlet and exhaust manifold would be different, engine accessories different, transmission linkages different, etc, etc.
As of now I'd stake my non-existent reputation on them being nearly new GMC hard cab CCKW's from 1941 being rebuilt because of shipping, handling, fire, or raid damage.