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My Dad was a top turret gunner in B-24s in the 490th Bomb Group 8th Airforce before they converted to B-17s I tell you this because he said this joke was going around at the time.
At an U.S.Army Airforce base in England, at a debriefing after a mission over German a waist gunner with a very heavy German accent is telling about his encounter with German fighters "One Focke came in and I hit him and he turned over smoking an vent straight down". The debriefing officer wrote something down "So you're claiming one FW-190 destroyed." The gunner became agitated "Nein!.. Nein!!..... The Focke was flying a Messerschmitt!!!"