I haven't read many tank manuals, but I'm willing to bet that most do not include a nude scene. This page, however, comes from one that did. Germany's Tiger tanks were among the finest of World War II. Germany wanted its operators to be well-prepared and so produced a manual with cartoons and odd analogies. You can view several pages from it at the link--including the nude scene.
http://www.artic.edu/aic/education/sciarttech/2d1.html