Early Jeep and weapons carrier, Ft. Lewis 1941
Certainly an early jeep! A Willys 'slatgrill' MB. According to its registration number it is about 1750 units and 1 week older than my my own slatgrill. I think it was delivered by Willys on either December 31st, 1941 or January 1st, 1942.
These photos are all a bit rough as they've been through a fire and also suffered water damage.
This is their Utility Vehicle, used to get out into the antenna sites. Note the antenna atop the vehicle, the generator power cable and the canteens.
I think that is the 'panel van' version of the Chevrolet G506 1.5 ton truck. The normal truck isn't common at all already, but the 'panel van' radio model is quite rare!