This image was acquired from
flickr. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
illustration drawing photo border Lot U.S. Naval Aviation Training Aids by U.S. Navy Training Division circa . Slide Major overhaul is beginning to think Dilbert is an axis agent. Artwork by Lieutenant Commander Robert C. Osborn USNR. Lot U.S. Naval Aviation Training Aids by U.S. Navy Training Division circa . Slide Major