Greg - no harm no foul. All five books I checked have that special set of camou insignia starting at the rank of unteroffizer or the SS equivalent. It can be a bit confusing as their system has corporals rated as both enlisted men and one as an nco, so maybe something got mixed up in the translation.
Only info found on the chevron type rank insignia (concerning the regular army ) was that it was in use by the end of December 1920. The only exceptions where it could not be worn were motorcyclist's overcoats, shirts worn as an outer garment, camouflage, and winter clothing.
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Dave - you got me thinking again (and that's a good thing - thanks!), so did more research on the starter adapter plate. I knew there was some variations in Tigers sent to Africa, and now found out there are specific differences between the two battalions' tanks.
The vertical positioning, as seen on the captured Bovington Tiger, was characteristic of 504th and their rounded exhaust shields. The 501st had the angled type shields with vents, and the starter plate should be as I originally had placed it. So off it comes again, but that's alright since I have to scratch build the pair of post it sits on - Tamiya omitted these.
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regards,
Jack