Post card from Peter Riedel sent to General Acevedo from Berlin on April 2, 1938. It was common practice in that era to add post card to back of photo. This documents that he was the Director of the Airforce and Minister of War (Defense). The original post card has the diplomatic seal stamped with date of delivery.
I wonder if the US would have completed their secret test flight to Colombia if they had known about this friendship with Mr. Riedel, who was "sent back" to Germany to assist with the development of their air force? Mr. Riedel competed in international Air Glider competitions and they met when Mr. Riedel was in Brazil trying to set a world gliding record and General Acevedo was also in Brazil.
Journaling on tag reads:
Check out the date and postmark! Amazing handwritten momento of historic and personal friendship between DH grandfather and Peter Riedel.
This friendship was critical to the beginning of the Colombian Air Force