I just got the pun about 'NDN' = Indian ^^
But to Adolf, it probably means
Neue
Deutsche
Nudisten
:1orglaugh
If you want any german support I can always help you got some old books from that time from grampa. Volk und Reich, Deutsche Rassenlehre, Unser Schöne Nordmark, Part 1 & 2, you name it. All the classics