A B-17 Flying Fortresses, including (serial number 42-31539), of the 306th Bomb Group fly past anti aircraft fire, leaving contrails duing a mission. Passed for publication 13 Apr 1944. Handwritten caption on reverse: '306 B/EP. Thurleigh Beds.' Printed caption on reverse: 'BIPPA. EA 18944. Cloud Cover For U.S. Attackers. Flying Fortresses of the Eighth Air Force, their contrails blending into clouds below them, head out over Europe to blast Nazi installations deep inside Germany. The large black burst in center of picture is probably a ground-fired enemy rocket. FA. Serviced by London OWI.' Printed caption on reverse: 'Watch Your Credit. Official U.S. Army Air Forces Photo. Washington, D.C. ' On reverse: 'Sacred', US Press Censor ETO and US Army General Section Press & Censorship Bureau [Stamps].