@DrewDad,
I'd have to go check, but i believe that the 332nd Fighter Group has been alleged to have had the distinction of never having lost a single bomber to enemy figherts in the entire history of their escort operations. By the way, properly escorting bombers means that you probably have
fewer kills of enemy fighters, because if one of them runs, your job is to return to protect the bombers, not chase after them to add another kill to your record.
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Further reading suggests that there is a good deal of recent controversy over the accuracy of that claim about the 332nd. An Air Force report a few years ago suggests that 25 bombers may have been lost to enemy fighters while escorted by the 332nd--although that is still an impressive record, given that the unit flew 15,000 sorties (a sortie is one plane flying one mission, and a plane and/or pilot can possibly fly more than one sortie in a day--on escort missions, however, just one mission per day is likely) during 1500 missions.
I can find no evidence that they were the most decorated fighter group of the war. They painted the group identification on the tail of their fighters in red, and became known as "the Red Tails." Their reputation for protecting their escorted bombers so tenaciously, and minding their business rather than tearing off to increase their kill records resulted in bomber crews requesting a Red Tail escort whenever they faced a difficult mission over Germany. It is generally thought that bomber groups did not necessarily know that the Red Tails were flown by black aviators.