Choice's Memoir was written ca 1896, and appears to be generally corroborated by contemporary source material. The only error which jumps out is that he (or his sister) called the battle of Wauhatchie "Vicksburg." Bound copies of the typescript are at the Kennedy Room, Spartanburg County Library, and the South Carolina Room, Greenville County Library.
Calvin Stephens transferred from K/Palmetto Sharpshooters, to C/Hampton Legion Infantyr, but I can find no record for him after late 1863. Ron, do you know what unit he served in during 1864-65? Please contact me re him, at Sturkey@wctel.net.