Rufus R. Dawes
He used the middle initial "R" but had no middle name.
In March, 1863, Dawes held the rank of Lt. Colonel and declined a promotion to Colonel In July 1864.
He was mustered out of the army on August 10, 1864 as a Lt. Colonel.
On February 24, 1866 Dawes was nominated to be appointed to the rank of Brevet Brigadier General by President Andrew Johnson and the Senate confirmed the appointment on April 10, 1866. (Dawes had been mustered out of the war before then. The most often cited official date of the end of the civil war is April 9, 1865 when General Robert E Lee surrendered the Army of Northern Virginia at the McLean House in the village of Appomattox Court House. There were battles and skirmishes after this date, but this is generally considered the official end of the civil war. So presumably, Dawes' rank at the end of the war was still Lt. Colonel.