Vapor trails of B-17’s from the 91st Bombardment Group
B-17 Bombers from the 91st Bombardment Group fly in formation above the clouds during World War II. The image was taken from the ball turret of a B-17 by Sergeant Joe Harlick, whose uniform and imagery are on display at the Jimmy Doolittle Center on Minot Air Force Base, N.D. (U.S Army Air Corps photo/ Sergeant Joe Harlick)