On the Bowers image is written "Row H, Ward B" which denotes the specific location in a hospital, in this case the General Hospital ("Gen. Hosptl.") in Annapolis, Maryland ("Md."), where a parole camp was located. I also see "W. H. H. Beadle," as in William Henry Harrison Beadle, who became Lieutenant Colonel "Lt. Col." of the 1st Michigan Volunteer Sharpshooters ("1st M. S. S." as it is written).
https://www.findagrave.com/memorial/5993484/william-henry_harrison-beadle
Chase is Assistant (Asst.) Adjutant (Adj.) General (Gen'l.) of Volunteers. An Assistant Adjutant General is the key staff officer post (chief of staff in modern parlance) serving a General officer and is thus found at the brigade, division, corps and army level.
Maybe William "Reinhardt," and possibly "G. Scheuerlin" of 36 Christie Street in New York City.