I went to the Census search page and entered the following in the lived in field "Coblenz, Germany, Military and Naval Forces" Year being 1920. I knew that the census did this in Germany as I saw another record from someone else that had that criteria. From there it was record by record to find someone from Loraine, OhioOnly hit that I got was a Frank Weight, from Lorraine, Ohio. My guess is that the enumerator for the census spelled Lorain incorrectly.
I am trying to narrow the window of when the person I am looking for was in Germany. I am looking for the periods of March to April of 1921.