This is a North American T-6 "Texan" operated by the Oklahoma Air National Guard. It is nicknamed the "Tulsey Town Chief". Tulsey Town being a very old name for Tulsa. It was on display at the Air Guard's Family Day September 11, 2010.
The North American Aviation T-6 Texan is a single-engine advanced trainer aircraft used to train pilots of the United States Army Air Forces, United States Navy, Royal Air Force and other air forces of the British Commonwealth during World War II and into the 1950s. Designed by North American Aviation, The T-6 is known by a variety of designations depending on the model and operating air force. The USAAC designated it as the "AT-6", the US Navy the "SNJ", and British Commonwealth air forces, the Harvard, the name it is best known by outside of the United States. It remains a popular warbird aircraft. See Wikipedia.