Dr. Massey
Here is Pvt Green's Parole Oath: http://www.fold3.com/image/#286835212
After his parole and oath it appears he may have been enlisted in Capt Miller's Battalion Co E 71st EMM at Marshall MO Jan 10th 1863. I see no evidenced that he was ever mustered out in said unit. This would certainly be a self preservation move in Saline Co 1863.
See. MO SOS file: http://www.sos.mo.gov/Images/Archives/Military/s00806/s00806_2288.pdf
My search has him back in Saline Co Missouri married to a Susan Green in the 1870 census dwelling 144, Elmwood Missouri as a farmer.
FWIW
John R