B-17 Flying Fortresses including (serial number 44-6700) of the 463rd Bomb Group, 15th Air Force in flight during a raid over Regensburg, 7 February 1945. Handwritten caption on reverse: '46700, 774BS, 463BG.' Printed caption on reverse: '60362 USAF - Boeing B-17 "Flying Fortresses" of the 15th Air Force head for the oil refineries at Regensburg, Germany, on 7 February 1945. Fortresses of the 15th AF, partially responsible for reducing Ploesti's oil 80% before the Rumanian city capitulated to the Russians, have been keeping up their persistent attacks against the few remaining sources of German oil supplies.' On reverse: US Air Force 1361st Photographic Squadron AAVS (MAC) Photo [Stamps]. B-17G-60-DL #44-6700 463rd BG - 774th BS - 15th AF