Rockwell International B-1 "Lancer" (Engl. Rockwell International B-1 Lancer-Ulan) is a supersonic strategic bomber with a variable sweep wing. Designed in the 1970-80 's by Rockwell International. Is in service with United States air force from 1986 onwards. Designed as a carrier of nuclear weapons to replace the B-52, but in the early 1990 's began the conversion of the B-1 aircraft to equip their conventional arms. Working wings, spoilers, sunroofs, bombootseki, turbine fire