A Soviet postcard / German feldpost

[McSeam]

Found this card recently, seemed interesting to me: it's not such a common thing that a Soviet postcard was used by an invader.
July 3, 1941. The second week of the war in USSR, German attacks are successful, the mood is good and Hans writes a letter to his mother using the trophy postcard. Judging by the feldpost number it’s 234th Infantry-Regiment, 56th Infantry-Division, XVII Army Corps, 6th Army. I wonder what has happened to Hans Röster later – if he was still alive when the 6th Army came to Stalingrad or maybe he was too lucky and even survived the war. Who knows.
I didn't understand, what was his rank?






And besides I have an issue of “Berliner Illustrierte Zeitung” from the same date as the letter is - July 3, 1941. Just like an illustration to the card.