Twin-engine training commenced at Tuskegee in 1943, at first using the AT-10. The 1944 US Army/Navy Directory of Airfields described Tuskegee AAF as having a 5,000' hard-surface runway. As constructed during World War II, Tuskegee AAF consisted of four asphalt runways (the longest being 5,200'), taxiways, a ramp, and a large number of buildings north of the field. The AT-10 twin-engine trainer was replaced at Tuskegee by the TB-25 Mitchell in 1945. The last pilot class graduated at Tuskegee in 1946, bringing the total number of pilots trained at the base to 992.