The mix of uniforms makes this look like an early group possibly. They do wear the DJ buckle. I don't think it's red cross but some sort of Feldscher unit. Just a guess on my part.
Yes Albrecht, they are in my opinion. They are either from a Sanitätskolonne
from the Red Cross or voluntary Krankenpflege. Boys from youth organizations
were trained as hospital orderlies. I guess the photograph to be about 1933.