I think that is a German DKW of some sort.
My HS shop teacher was a crewman on B-25s in the Mediterranean theatre, and he survived all his missions just fine, but a joyride on a motorcycle left behind by the Germans ended up causing his only serious war injury. You might say he was "down" on motorcycles.
Mr. niteowl77
Thanks that is interesting. The more I think about it, I think the photo was from 1944 or 45 as it was in Europe.