The Cross in the foreground designates the Colonel Reed as being a member of the Confederate Army. He was born in 1846, which would have made him 15 when he went to war, assuming that he signed up at the start of the war. This is rather safe assumption given that South Carolina was the first state to withdraw from the Union and that the war began at when Union Troops fired on Fort Sumter on April 12, 1861. Whatever the case, he would have been little more than a kid whenever he enlisted, as the war ended when he was 19: rather young for a Colonel.
As it turns out, I examined the grave more closely, and Col. Reed, lost an arm at the battle of Hawes Shop on May 28, 1864, 8 days prior to his 19th birthday.