It's a tactical marking for aircraft from Luftflotte 4. http://simhq.net/forum/ubbthreads.php/topics/525435/ULTRA_messages_about_Luftwaffe.html
Yellow Chevron Marking
From ULTRA decrypt HP 1207 of September 1944:
"Early 22nd [september 1944] Luftflotte 4 appreciated that on Rumanian front 'the enemy' was operating German aircraft in some cases with German markings. In order to identify German aircraft with certainty additional recognition markings in yellow paint ordered for Bf 109, FW 190, Ju 87, Ju 88, Ju 188, Hs 129, He 111 and Do 217. 40 cm ring around fuselage in front of wings. Lower side of port wing, whole width of wing a Victor [yellow chevron] open towards direction of flight with an angle of 45 degrees and arms 25 cm broad. The arms of the Victor to be carried over leading edge of wing to upper side for distance of 60 cm to permit recognition from above also. Completion to be reported by early 25th, from then on all above aircraft not carrying new markings could be fired on at 30 km distance from front."
Yellow Chevron Marking
From ULTRA decrypt HP 1207 of September 1944:
"Early 22nd [september 1944] Luftflotte 4 appreciated that on Rumanian front 'the enemy' was operating German aircraft in some cases with German markings. In order to identify German aircraft with certainty additional recognition markings in yellow paint ordered for Bf 109, FW 190, Ju 87, Ju 88, Ju 188, Hs 129, He 111 and Do 217. 40 cm ring around fuselage in front of wings. Lower side of port wing, whole width of wing a Victor [yellow chevron] open towards direction of flight with an angle of 45 degrees and arms 25 cm broad. The arms of the Victor to be carried over leading edge of wing to upper side for distance of 60 cm to permit recognition from above also. Completion to be reported by early 25th, from then on all above aircraft not carrying new markings could be fired on at 30 km distance from front."
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