The same photo appears on page 258 of Jean-Bernard Frappé's
La Luftwaffe Face au Débarquement Allié in the chapter on I./SKG 10. The caption translates as:
…Only one of them, Ofhr. Herbert Batz (second from left) can be identified. His comrades remain unknown. All seem to be pilots, as attested to by their ranks of Feldwebel or Oberfeldwebel as well as by the Iron Cross first class which decorates their flying jackets.
The photo itself is attributed to Wolfgang Zebrowski, who was a pilot with I./SKG 10 in Normandy and wrote a memoir,
Nachts über den Wolken.