I have been wondering about the exact nature of such units for a while. I have reproduced a set of relevant links below, for reference and perhaps a response by those who have some additional information
Feldwebel Heinrich Stoklassa, born on 02.02.1918 in Kauthen (modern day Kouty) in the Sudetenland
http://www.hultschiner-soldaten.de/_...sch.php?id=548
"V prosinci 1942 byl převelen do Prowehren/Osstpreussen (1. Flughafen-Betriebskompanie der Lehrgruppe für Nachtflugausbildung ). A od března 1943 sloužil v Schaulen/Lotyšsko." - Czech text
Google translate and my editing give the following - "Was transferred to the 1. Flughafen-Betriebskompanie der Lehrgruppe für Nachtflugausbildung in Prowehren in December 1942. From March 1943 he served in Šiauliai."
Thread about Sondergruppe L, started by Norbert in 2011
http://forum.12oclockhigh.net/showthread.php?t=25799
Some loss details provided by Jim Perry in 2012
http://forum.12oclockhigh.net/showthread.php?t=30786
Andrey's thread of early July 2016
http://forum.12oclockhigh.net/showthread.php?p=220278
Andrey's thread of mid-July 2016
http://forum.12oclockhigh.net/showthread.php?t=45546
Thread about Bombenfliegerschule Bobruisk on Axis History of February this year, with Larry's answer within
https://forum.axishistory.com/viewtopic.php?t=233622
Blindflugschule 2
Took over Nachtfluglehrgang 2 (Bobruisk) on 6.4.43 as Einsatzgruppe der Blindflugschule 2, which moved to Baranowitschi 26.7.43, and became Einsatzgruppe der 2. Flieger-Schul-Division on 17.11.43.
http://www.axishistory.com/books/160...indflugschulen
Blindflugschule 9
http://www.ww2.dk/air/schule/b9.htm
"
Durch Nachtfluglehrgang wurde Bandenort Albinsk (32 km südwest. Glusk) mit Bomben und Bordwaffen angriffen und zum Teil zerstört."
http://www.rogachev.de/stadt/history/ktb/1943_02_22.htm
"
Durch Nachtfluglehrgang wurden die Bandendörfer Franzusskaja-Greblja (8 26 km nordwestl Osipowitschi) und Borki (43 km nordostw. Bobruisk) mit gutem Erfolg bombardiert."
http://www.rogachev.de/stadt/history/ktb/1943_02_27.htm
EKM (dog tag) number assigned to Nachtfluglehrgang 4
https://www.forum-der-wehrmacht.de/i...9-ekm-53999-b/
I have the impression that these units were considered of such limited combat value that they were only employed against partisans, but there is no information which would allow a definitive conclusion.
Regards,
Dan