Nacht Jagd Schule Schleissheim

Hi, I was looking for any information about the Night Fighter Training School at Schleissheim. I was aware that my Grandfather was a flight instructor in the Luftwaffe called Kurt Martin and was killed 2 months before my Mother was born. Other than that information was very limited. I have just come across a plaque, probably a memorial, engraved to Feldr Martin and (translated) " for Special Services to Flightinstructing" and then N.J. Schule, Schleissheim. I'm assuming N.J is Nacht Jagd?

It is engraved underneath with the date "den 6.11.42" and "Major u. Leiter d. Aush. Gruppe"

Any information would be very gratefully received!