Prior to the KC-46 Pegasus, Boeing had another go at selling the 767 to the USAF as a tanker.  The aircraft that they had intended to be the solution at that point was a different configuration to what ultimately made its way in to the inventory.  They went as far as building a speculative airframe for the project.  However, when the project was aborted (for reasons that are far too complex for a simple blog post), the airframe lay unfinished.  It was stored for a while at Paine Field before eventually being scrapped.  Here is a shot of it prior to its demise.