Also, to the best of my knowledge, the USAF never had any civvy Power Wagons. They had some Dodge WC models which were replaced by the M37 when it was introduced, though. Maybe the model is supposed to represent one of these? As for the "UMSM" thing, it could be a typo. With a teletype keyboard, you have to type "Figs M Ltrs" to get a period. Maybe they just forgot to hit the "Figs" key.
It's still a cool model! I'd love to have a civilian PW someday.
-John
Member of Dixie Division MVC
1953 USAF M37 wow, restored
1962 M151 Ford Production, on the rotisserie now
1953 USMC M37 w/w -in storage
1942 M6 Bomb Service Truck (sold to UK collector)
1967 M116A1 Pioneer Trailer
1968 M101A1 Trailer
S-89 Comm box
Hey Eddie no apologies necessary!!! M37's are the other power wagon !!! I love your strata blue beast!! It means even more with both my kids in the USAF!! Maybe some day I 'll paint mine the same!!