My dad was a belly turrent gunner on a B-17. Said they flew a beautiful, new F or G version to England from America through Iceland ("no ice") and Greenland ("no green") into Scotland, then down to England. So, he says they are all excited to fly this nice new bird into Europe......only to find out an experienced crew was getting the Fort they flew in, and they get a "beat to hell" E version. He said they grew to love the E, since it got them out and back every time. If I can find the picture of him and his crew, I will scan and post. I do love the Fort. That was one tough bird.