The red-bordered insignia was adopted on 29 June 1943 and dropped on 14 August of
the same year. The official instructions for the new insignia read: “The National Insignia
shall be an Insignia White five-pointed star inside an Insignia Blue circumscribed circle
with an Insignia White rectangle, one radius of the Blue circumscribed circle in length
and one-half radius of the Blue circle in width, on each side of the star and the top edges
placed to form a straight line with the top edges of the two star points; and an Insignia
Red border one-eighth radius of the Blue circle in width outlining the entire design.”
From “Air Classics” “20th Anniversary Special Edition 1964-84" 1985 Vol 1 page 40
On 14 August 1943 the Red border was replaced by a Blue border and that was the standard until January 1947.
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