B-17 Flying Fortresses of the 92nd Bomb Group fly in formation during a training exercise. Aircraft are, from left to right: B-17E (serial number 41-9022) nicknamed “Alabama Exterminator”, B-17E (serial number 41-9023) nicknamed “Yankee Doodle”, B-17E (UX-?, serial number 41-9017) nicknamed “Heidi Ho”, B-17E (UX-V, serial number 41-9013), B-17E (UX-S, serial number 41-9154) nicknamed “The Bat out of Hell”, and B-17E (serial number 41-9132). ©IWM