In mid-1942, 45 B-17Es were turned over to the RAF as Fortress IIA. RAF serials were FK184/213, FL449/460, and FL462/464. The were called Fortress IIA because they were existing types transferred from the USAAF, whereas the Fortress IIs were allocated from new construction.
Place this skin in the B-17F folder. I used the F instead of the E since the in-game model is closer to what actually appeared in WWII.