I believe that the desert tan/yellow, was the primer
color from the factory.. I think that changed several times
during the course of the war.. Near the end, no paint at all...
Guys in the field, (railheads) would splatter them with
whatever camo was mandated by the unit... At the
same time they were checked out, assigned a crew,
loaded w ammo and supps, etc...
I've also read that some vehicles were equipped w paintspray
setup.. So they could change cammo on battlefield...
Very forward thinking!
Ah well, Panzer grey would have been nice...
Maybe someday... 2 weeks?

RC