Not sure if this is related, but there is a record on Ancestry that has a 16 year old John Turner born in Marion County, South Carolina who enrolled in the military in Charlotte, NC. Source: Ancestry.com. U.S. Army, Register of Enlistments, 1798-1914 [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2007. Original data: Register of Enlistments in the U.S. Army, 1798-1914; (National Archives Microfilm Publication M233, 81 rolls); Records of the Adjutant General’s Office, 1780’s-1917, Record Group 94; National Archives, Washington, D.C.
It's hard to read, and it might not be the right John Turner. But it's something.