Oberleutnant Ostermann, Staffelkapitän, 7. Staffel, Jagdgeschwader 54 achieved 102 victories in over 300 operational sorties - downed 5 times.
00.03.1937: joined the Luftwaffe as a Fahnenjunker
01.08.1939: promoted to Leutnant
00.09.1939: Lt., 1. Staffel, ZG-1
00.03.1940: transferred to the 1. Staffel, Jagdgeschwader 21
00.04.1940: 1./ JG-21, located in Guines, France
20.05.1940: 1./ JG-21, 1st known victory, a Morane 406 West of Peronne
00.08.1940: 1./ JG-21 renamed 7./ JG-54
12.08.1940: Lt., 7./ JG-54, 2nd victory, a Spitfire
30.08.1940: Lt., 7./ JG-54, with Bf 109E-4 coded "White 2", downed his 4th, a Spitfire
01.09.1940: Lt., 7./ JG-54, shot down with Bf 109 E-4 coded 'White 11 +' by a Spitfire over the Boulogne Canal - force landed near St.Inglevert airfield
09.09.1940: 5th, a Hurricane over England
00.10.1940: felw Bf 109E-4 coded "White 5"
00.04.1941: flew Bf 109E-4 coded "White 3" in Romania
23.06.1941: Lt., 7./ JG 54, first known Soviet victories, both SB-2s
26.06.1941: Lt., 7./JG 54, unhurt when Bf 109 F-2 coded 'White 2' force-landed near Dünaburg due damaged caused by malfunctioning 20mm cannon
00.07.1941: Lt., Staka, 7./ JG 54
01.08.1941: Lt., 7./ JG 54 most likely in an F-2 (or F-4) coded "White 2" downed JG-54s 1000th victory
04.09.1941: promoted to Oberleutnant - RDA 01.09.1941
25.10.1941: Olt., Staka, 7./ JG 54, 1 victory with Bf 109F-2 coded "White 2"
05.11.1941: Olt., appointed Staka, 3./ JG 54
13.11.1941: Olt., Staka, 3./ JG 54, 1 victory
30.11.1941: Olt., Staka, 3./ JG 54, 1 victory
01.01.1942: Olt., Staka, 3./ JG 54, 1 victory
12.03.1942: Olt., appointed Staka, 8./ JG 54
17.03.1942: Olt., Staka, 8./ JG 54, 1 victory
10.05.1942: Olt., Staka, 8./ JG 54, unhurt when Bf 109 F4 coded 'Black 1' force-landed South East of Leningrad due to anti-aircraft damage
12.05.1942: 2nd JG-54 pilot to achieve 100 victories in Bf 109F-4 Werknummer 13.114 coded "Black 1" then severely WIA by shell fragments in the thigh and fore arm when shot down in Bf 109F-4/Z Werknummer 13.125 coded "Black 1" - force-landed successfully near Poselok, near Ljuban airfield, Pl.Qu. 10413
01.08.1942: Olt., re-appointed Staka, 8. Staffel, JG-54
09.08.1942: Olt., Staka, 8. Staffel, Jagdgeschwader 54, KIA in Bf 109G-2 Werknummer 10.438 coded "Black 1 + I" by 9 Russian P-40 fighters near Amossovo, north of Velikiye Luki, Russia - died after taking canopy hits - crash-landed near Detjurewo airfiled
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