After the surrender of Germany in May 1945, two Douglas company aerodynamicists, Gene Root and A.M.O. "Amo" Smith, went to Paris to assess aerodynamic data captured from the Germans. The two obtained quite a haul of material, including wind-tunnel test data performed on models of tailless aircraft designed by Dr. Alexander Lippisch. Lippisch had actually developed a production tailless combat aircraft, the Messerschmitt Me-163 rocket fighter, and had many other ideas for tailless aircraft, particularly with delta wings. Root and Smith also had an opportunity to chat with Dr. Lippisch, who was then in Allied custody in Paris.