GB-1 glide bomb of the United States Army Air Force.
Unknown author<span style="display: none;">Unknown author</span>
mid-1940s
USAF photograph via International Missile and Spacecraft Guide, 1960 and <a rel="nofollow" class="external autonumber" href="http://www.designation-systems.net/dusrm/app1/gb.html">[1]</a>