WW2 USAAF squadron patch.
This is a hand embroidered U.S.A.A.F. squadron patch for the 324th Bomber Squadron of the 91st Bomber Group which was part of the 8th Air Force.
This was the unit that the Memphis Belle was part of in World War Two.
This is the large patch which would have been stitched onto the left breast of the A2 leather jackets.