What take the XXI so long?
It took the IX 2 months from first launch to first patrol. While it took the XXI almost a year. The first XXI were launched in may 1944, just a month before the normandy landings. XXI would have at least slow the torrent of troops and materials flowing onto the continent. Why didn't BdU give a XXI to a veteran submariner, said brandi or Luth, and let them test it in Combat?
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