What’s your evidence that Lee knew a little a German?
I don’t even think it looks like “Gut Schieffer” to be honest.

Thanks for your valued opinion.... You rarely offer an opinion in support of a rebuttal.
So perhaps you'll offer an opinion about why in the world would the US government be sending Lee a "draft card" when he is supposedly a traitor who had defected to Russia?? .... And I believe the message of " good Marine" was concealed in the signature..
The news papers had reported that Lee Oswald was an turncoat ( and therefore an undesirable candidate for the military ) and yet they send him a "draft card that had him classified as IV-A ( 4-A) which is a classification for a highly desirable individual.