Some marching songs I'm curious about. Are these essentially soldiers' songs, where do they come from, and are they considered respectable?

Ein Heller und ein Batzen
Erika
Westerwald
Maruschka (Everyone seems to know Maruschka, but I'd hesitate a long time before singing it to a Pole!)
Maerkischer Heide(This sounds innocent enough, but when I had a lot of German friends, they assured me it is not. Assuming all the songs are considered o.k. except Maerkischer Heide, as seems to be the case, how is it different from the others?