Jagdlehrerüberprüfungsgruppe
From "The Luftwaffe 1933-45" web site. This unit evolved from Jagdfliegerschule 5 and on 1.06.44 was redesignated as II./JG 110.
I don't know the exact nature of this training unit but based on its name I would guess that it had to do with preparing combat pilots to take on the role of fighter pilot instructors. I could be totally wrong about that of course.
Tom
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