[Merlin]

Andrey,

the Nachtfluglehrgänge were blind flying training courses for bomber crews operating at the Eastern front and not combat units. These refresher training became necessary because more and more night operations were required even over Russia.

The switch to an operational unit happened with the formation of Einsatzgruppe BFS 2 in July 1943 and later Einsatzgruppe 2.Fliegerdivision in November 1943.