DFS Kranich [crane] training glider with markings that appear to read D-17-606. The D-17 designation would allocate the aircraft to the NSFK [Nationalsozialistisches Fliegerkorps, i.e., National Socialist Flyers Corps] Gruppe Ostmark, after the "Anschluss" of Austria in 1938. The Kranich was designed in 1935 by Hans Jacobs for the DFS [Deutsche Forschungsanstalt für Segelflug; German Research Institute for Sailplane Flight]; it was primarily intended for performance and blind flying training.
The Kranich pictured above can be seen resting on its jettisonable undercarriage dolly; another such undercarriage dolly is located on the ground between the individuals at right.
The three aircraft in the background are Grunau Baby gliders, designed by Edmund Schneider. Location and exact date unknown. (German Aviation 1919-1945 collection)