Kosse had previously served with JG 26 and had 10 victories when in May 1942, he was transferred to a gunnery course. On completion he was transferred to 1./JG 5 where he became Staffelkapitän. In June 1943 Kosse became Staffelkapitän of 5./JG 5, but in November he was relieved of his command and demoted for making an unauthorised flight during which he damaged an aircraft. In January 1944 Kosse volunteered to serve with Sturmstaffel 1 and flew Reichsverteidigung duties with this unit and also with JG 3, subsequently becoming Staffelkapitän of 13./JG 3. His final victory tally is not known, sources varying between 20 and 46, but the correct figure is believed to have been around 28. Hptm. Kosse was shot down by a Tempest and killed on 24 December 1944.
Source: Jadwaffe Holding the West by David Wadman and Mertin Pegg.
The screenshot is "Work in progress", but I hope to have this repaint finished somewhere this weekend.
Huub
