(https://imagizer.imageshack.us/v2/745x747q90/690/2pxu.jpg)
Flying saucer at 9 o'clock!
July 1942. "Training high school boys to identify planes. There's no question about these young people's ability to recognize airplanes by their silhouettes. They're learning this and other essential facts of aviation at Weequahic High School, Newark, New Jersey, in a course designed to teach students the fundamentals of flying." Office of War Information photo.
Source and higer-res version: http://www.shorpy.com/node/16854 (http://www.shorpy.com/node/16854)