Lavochkin is a Soviet aerospace design bureau founded in 1939. Its head designer was Semyon Alexseyevich Lavochkin (1900-60), who produced a series of excellent single-engined fighter aircraft for the Soviet Union through World War II and afterwards. Lavochkins were the final piston-engined fighters used by the USSR, seeing action through the Korean conflict. After the war, Lavochkin had less success in designing jet aircraft, and focused more on rockets and missiles. It exists today primarily as a developer of rockets and spacecraft.