I spoke with my grandfather over thanksgiving. He was a bomber pilot during the war but he never shipped out overseas which pissed him off at the time but now he says "I was one lucky sob".
He started out in a B25 outfit and was expecting to ship out with his unit soon, he had a brother flying 25's in the Mediterrian. Anyways one day the guys got called out and were told that they needed 5 "volunteers" to help train a batch of chinese pilots that had been flown over in the art of ground attack and strafing. My granpa said to hell with that I've been trained to fly combat. Well the next morning guess who's name was on the top of the list of "volunteers"
So skip ahead a couple months or whatnot and he gets transfer orders to join a new B17 group being formed at the neighboring airfield. He reports and is telling the guys about how he and the other B25 pilots used to get kicks by climbing up above the B17's feathering an engine and diving past them and waving. When the instructor shows up and says congradulations you're going to become B17 pilots. Gramps tells him "to hell with that, I'm a B-25 pilot" On his first flight right in the middle the instructor leans over and without warning feathers 2 props once the plane has stabilized a little looks at gramps and says "can you do that in a b25?" grandpa shut up about the b25 after that.
So finally the day arrives where they are going to be shipping out soon and they need to get their vaccinations. Now apparently the way it worked was the men were lined up single file and marched through this room they'd get a shot in the right arm then step forward and get the next in the left so on and so forth. Well he steps up gets his shot and turns around to say say something to the guy behind him and zap, get's a 2nd shot in the left arm. Now they're getting poked and prodded all over in this room so he thinks nothing of it gets through and marches off to the parade ground to get breakfast makes it about halfway and wakes up in the hospital several hours later. To this day he has no idea what they stuck him with twice.
So the group ships out while he's in the hospital, eventually they release him and he goes back into the general pilot pool and they fly every couple days or so to stay sharp till one day they go out to the flight line and there's parked a B-29. And once again they need "volunteers". "To hell with that! I'm a B-17 pilot".. so you can guess who's name was on the top of the list.

The war ended before he got shipped to the pacific.