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453rd operations group had a circle J designation on the tail and flew B-24s. Jimmy Stewart's group. Maybe they also had wing markings? https://en.m.wikipedia.org/wiki/453rd_Operations_Group
Yup, circle J. Am currently reading this book--https://www.amazon.com/Jimmy-Stewart-Bomber-Starr-Smith/dp/0760328242/ref=sr_1_3?s=books&ie=UTF8&qid=1502429292&sr=1-3Triangle = 1st DivisionCircle = 2nd DivisionSquare = 3rd Division
At least some of the WWII bombers had tail flashes from where they were based. For instance, K was for RAF Kimbolton. On some of the B-52G models that are in the boneyard now you'll find a big letter K. That's because they were part of the 379th Bombardment Group whose heritage goes back to there.