From the National Library of Medicine:
Alexander T. Augusta was freeborn in Norfolk, Virginia in 1825. He sought a medical education in Canada after being denied admittance to medical school in the United States because of his color. Augusta became the first African American commissioned medical officer in the United States Army when he was appointed surgeon with the Union Army in April 1863. He was friend and mentor to fellow black surgeon Anderson R. Abbott, and worked side-by-side with him at Contraband Hospital in Washington, D.C. Augusta served as surgeon-in-charge at Contraband Hospital for six months before mustering in with his regiment, the 7th Infantry of the United States Colored Troops, as their regimental surgeon.
We’ve got an entry in the works on United States Colored Troops from Virginia, but alas, it’s not done yet.