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I have a copy of the late J.M. Massaro's book "Distinctive Insignia of the U.S.Army Air Forces 1924-1947", looking through it there is a picture of the 91st Reconnaissance Squadron which was based on the WWI 91st Observation Squadron insignia from WWI, the photo is to small to be of any use. Information on the insignia from the book....

It was approved as an aircraft marking on 12 Feb. 1924 but was never approved for use as a DUI. M.S.Meyer did produce the insignia during the early stages of WWII, It was worn even though it was not officially approved. Size 25x43mm ASMIC# 91A1. A mounted knight in armor chasing a devil. Grey armor, green shield with a black patriarchal cross piped in white, yellow plume, brown spear, black horse.red devil with brown fork. That is the official description. The DUI manufactured by Meyer had the knights shield bearing the numerals 91 instead of the patriarchal cross as mentioned in the official description.

The DRAWING of the 91st I have attached comes from Dept. of the Air Force book "Combat Squadrons of the Air Force World War II", and shows the insignia as originally described in Massaro's book.

Flypaper.