This is the Prisoner of War Release for William Pelham McGehee. A copy of this document is in the museum at Point Lookout, Maryland. The original is in the McGehee family collection.
This document also served as a free pass for any public transportation. The bearer had but to show the document, and he was allowed to ride free of charge. This is part of the system devised to get the Confederate prisoners back home following their release.

POW Release - Front

POW Release - Back
Nice site! It’s amazing that that POW release was preserved and in such good shape! I’ll come back when I have time to read further!