The North American P-82 (later redesignated F-82) Twin Mustang was the last American piston-engine fighter ordered into production by the United States Air Force. Based on the P-51 Mustang, the P-82 was originally designed as a long-range escort fighter in World War II, however the war ended well before the first production units were operational.
Info: Wikipedia
http://en.wikipedia.org/wiki/North_American_F-82_Twin_Mustang
Profile: Wings Palette
http://wp.scn.ru/en/