Training of African-American men as aviation medical examiners was conducted through correspondence courses until 1943, when two black physicians were admitted to the U.S. Army School of Aviation Medicine at Randolph Field, Texas. This was one of the earliest racially integrated courses in the U.S. Army. Seventeen flight surgeons served with the Tuskegee Airmen from 1941-49. At that time, the typical tour of duty for a U.S. Army flight surgeon was four years. Six of these physicians lived under field conditions during operations in North Africa, Sicily, and Italy. The chief flight surgeon to the Tuskegee Airmen was Vance H. Marchbanks Jr., MD, a childhood friend of Benjamin Davis.