The North American T-6 Texan was the premier advanced trainer through World War II and later. It was also used as a FAC (Forward Air Control) aircraft in Korea and Vietnam. The AT-6 was also known as the SNJ by the US Navy and the Harvard by the RAF. 61 countries have used some variant of the Texan. If you can’t find markings that interest you, just keep looking.
My personal attachment to the T-6 comes from my friend Tom Kelly, who gave me a ride in his T-6G. We went to Oshkosh for the Air Rendezvouz in 1986. You get a really respectful greeting when you arrive in a warbird, even if you’re only in the back seat.