Northrop YB-49 Flying Wing

Both found on http://redonly.tumblr.com/

if you want to learn a bit about flying wing design origin, it goes back to the mid 1930's: http://justacargal-s.blogspot.com/2011/02/burnelli-or-northrop-flying-wing.html

the above is labeled Northrup YB-49 Flying Wing, 1947
found on http://cetaceous.tumblr.com