Roster of Confederate Soldiers, 1861-1865, shows:

Copeland, Solomon A. TN 25th Inf. Co.D

and

Copeland, Andrew C. TN 25th Inf. Co.D
Copeland, Barnabas TN 25th Inf. Co.D
Copeland, George TN 25th Inf. Co.D
Copeland, Jackson TN 25th Inf. Co.B
Copeland, James M. TN 25th Inf. Co.B
Copeland, James R. TN 25th Inf. Co.H Capt.
Copeland, James S. TN 25th Inf. Co.D Sgt.
Copeland, Jefferson TN 25th Inf. Co.D Sgt.
Copeland, John S. TN 25th Inf. Co.H Sgt.
Copeland, Joseph A. TN 25th Inf. Co.H
Copeland, Joseph J. TN 25th Inf. Co.D
Copeland, Mitchell TN 25th Inf. Co.D Sgt.
Copeland, Phillip F. TN 25th Inf. Co.D
Copeland, Silas TN 25th Inf. Co.I
Copeland, Solomon F. TN 25th Inf. Co.D
Copeland, Thomas B. TN 25th Inf. Co.H

Looks like the regiment should have been called the "Copeland Rifles".

25th TN Inf Reg organized at Camp Zollicoffer, Overton County, on 08/10/1861. Mustered into Confederate service at Camp Myers, Overton County, 10/01/1861. Reorganized at Corinth, MS 05/10/1862. Field Consolidation with 44th TN Inf Reg Consolidated from Nov 1863 to 04/09/1865. Surrendered at Appomattox Court House, VA, 04/09/1865.
ASSIGNMENTS:
Dept of East TN, Dept #2, Nov 1861-Jan 1862
Zollicoffer's Brigade, Dept of East TN, Dept #2, Jan-Feb 1862
Carroll's Brigade, Dept of East TN, Dept #2, Feb-Mar 1862
Marmaduke's Brigade, 3rd Corps, Army of MS, Dept #2, Apr-July 1862
Marmaduke's Brigade, Wood's Div, Army of the MS, Dept #2, July-Aug 1862
Johnson's Brigade, Wood's-Buckner's Div, Left Wing, Army of the MS, Dept #2, Aug-Nov 1862
Johnson's Brigade, Buckner's-Cleburne's Div, 2nd Corps, Army of TN, Nov 1862-May 1863
Johnson's Brigade, Stewart's Div, 2nd Corps, Army of TN, May-Sept 1863
Johnson's Brigade, Stewart's Div, Buckner's Corps, Army of TN, Sept 1863
Johnson's Brigade, Stewart's Div, Johnson's Provisional Div, Army of TN, Sept 1863
Johnson's Brigade, Stewart's Div, Buckner's Corps, Army of TN, Sept-Oct 1863
Johnson's Brigade, Stewart's Div, 2nd Corps, Army of TN, Oct-Nov 1863
Johnson's Brigade, Buckner's Div, Dept of East TN, Nov 1863 - May 1864
Johnson's Brigade, Hoke's Div, Dept of NC & So. VA, May 1864
Johnson's Brigade, Johnson's Div, Dept of NC & So. VA, June-Aug 1864
Johnson's Brigade, Dept of Richmond, Aug 1864 - Jan 1865
Archer's and Johnson's Consolidated Brigades [McComb's], Heth's Div, 3rd CXorps, Army of N. VA, Jan-April 1865

BATTLES:
Mill Springs, 01/19/1862
Corinth Campaign, Apr-Jun 1862
Munfordsville, 09/17/1862
Perryville, 10/08/1862
Murfreesboro, 12/31/1862-01/03/1863
Tullahoma Campaign, June 1863
Hoover's Gap, 06/24/1863
Chickamauga, 09/19-20/1863
Chattanooga Siege, Sept-Nov 1863
Knoxville Siege, Nov 1863
Port Walthall Junction, 05/07/1864
Drewry's Bluff, 05/12/1864
Drewry's Bluff, 05/16/1864
Petersburg Siege, June 1864 - April 1865
Fort Harrison, 09/29-30/1864
Appomattox Court House, 04/09/1865

Sifakis - Compendium of the Confederate Armies - Tennessee - p. 130-132