The Texan was used by many Allied countries, as well as the Army Air Corps and the Navy, where it was called the SNJ. In Britain, it was called the Harvard, while an Australian derivative was called the "Wirraway". Harvards were produced in several countries and in all, over 20,000 aircraft were produced. Harvards were used by the RAF as trainers until 1955.
American T-6's served mostly as trainers, but foreign versions did see combat. One Wirraway was even credited with the downing of a Japanese Zero. The T-6 also saw service in Korea, where they served as forward air controllers with the 6147th Tactical Control Group, designated as LT-6. They carried an observer in the back seat and were armed with smoke rockets to mark targets for fighter-bombers.
The display aircraft at Castle Air Museum was built in 1940 for the RAF who called it "Harvard Mk. II". It was used in the Commonwealth Air Training Scheme in Canada. It is painted in the colors of a trainer as it would have appeared in the mid 1950's.