The North American T-6 Texan two-place advanced trainer was the classroom for most of the Allied pilots who flew in World War II. Called the SNJ by the Navy and the Harvard by the British Royal Air Force, the AT-6 (advanced trainer) was designed as a transition trainer between basic trainers and first-line tactical aircraft. It was redesignated T-6 in 1948. In all, the T-6 trained several hundred thousand pilots in 34 different countries over a period of 25 years.