Have a look at this link John, it may answer your questions - and raise others !
https://www.britmodeller.com/forums/...7-camo-scheme/
Would seem someone is in the know:
"B-17s arrived in the
ETO in standard olive drab over neutral grey, but it was decided that with the chances of the Luftwaffe attacking airfields (keep in mind the 8AF started arriving in 1942) that extra camouflage was needed to break up the outline of the aircraft whilst at dispersal.
There was some guidance sent through from 8AF HQ which stated that medium green blotches should be painted onto the leading and trailing edges of flight surfaces and the vertical tail, as well as along the upper fuselage.
As this was applied in the field, it varied hugely between aircraft and bomb groups. Sometimes, RAF Dark Green was used when US supplied Medium Green ran short."
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