In response to queries about Rechlin being the main airfield.
The one posted in the photo was the original aerodrome with all of the complex and comprehensive test facilities much like RAE Farnborough. This remained the case throughout the war. However, when the jets came along Rechlin was not able to accomodate them or to be easily extended to do so, so they built a new aerodrome a mile or so south with hard runways and not much else (known as Rechlin-Larz). So the original remained the 'parent field'.
The adjacent Muritz lake was also used for seaplane and marine craft testing.
Thought you might like to know...