Thanks for the reply. I went to the Camp Chase Web site to try to get more information about the possibility of Confederates from Camp Chase joining the more than 10 Ohio regiments organized at Camp Chase in March 1865, including the 195th. Here is the link.
http://www.geocities.com/Pentagon/Quarters/5109/Chronicles_1865.html
The Camp Chase Chronicles for February and March 1865 support your view that many Confederate prisoners when offered the chance to be paroled for exchange elected to "Stay" in confinement at Camp Chase. What happened to these men? Some of the material in the Chronicles suggests that some joined Union regiments (U.S. Volunteers, known as Galvanized Yankees?) and at least two companies were organized and headed for Chicago to serve on the Plains. The 195th Ohio, however, once organized was sent to Winchester, Virginia, initially, and then to garrison duty in Alexandria, Va., until the end of 1865. Any additional light you can shed on whether the Confederates who elected to stay ever joined the Ohio regiments organizing at Camp Chase in 1865 would be appreciated.