My last glider flight was in a Ka8B, HB-763 at Montricher in July 1974. I loved it, but I got involved in a Cessna 170 and never got back to gliding....
The only possibility I can think of (if it does turn out to be this aircraft) is that the Intelligence Officer got muddled with his notes as ANOTHER...
A well put together piece, but the description of how the Dornier 17 may have "entered the water" still does not sit with the recorded description of...