The Heinkel He 219 "Uhu" was a German, twin-engine night-fighter, that was used during World War II. It was the first aircraft of the Luftwaffe to be equipped with ejection seats and the first World War II-era aircraft with a tricycle landing gear. The aircraft was also equipped with a Lichtenstein radar. Development of the aircraft had many problems and delays, caused by rivalries between Josef Kammhuber, commander of the German night fighter forces, Ernst Heinkel, the manufacturer, and Erhard Milch, responsible for aircraft construction in the Reichsluftfahrtministerium, so that only small numbers were built.