sentences:  On 28 December 1939, he was transferred to the "Ergänzungs-Jagdgruppe Merseburg", another supplementary training unit stationed at Merseburg, where newly trained fighter pilots received instruction from pilots with combat experience.He stayed there until 7 January 1940, one day later, Rudorffer, now an "Oberfeldwebel" (staff sergeant), was posted to the 2.