In this book

There is this picture

With this caption

So my question is, were "light-colored anti drag rings" a thing?

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The exact wording antidrag ring is used in the B-17F E&M manual - see attachment. Nose cowl or cowling ring is another form of description of the same part.That seems likely to me...
I hope you got what you needed.Mmmm . . . I just remembered Perkins has good onion rings, and the only one in the Twin Cities that is open 24 hrs is only 1.2 miles away.