This is actually N471DF ex 68-10970.

This aircraft was cancelled from the USCAR in July 2002 as "Destroyed" but no record of an accident could be found. It is now exhibited at Palm Springs Air Museum, CA., painted in USAF colours and bearing the false serial 21331. The real 21331, (67-21331), which served with the 20th Tactical Air Support Squadron at Da Nang, South Vietnam, in the late 1960s, is exhibited in the National Museum of the USAF at Dayton, OH.

According to the data plate on this aircraft it is a Cessna M337B and USAF serial number 68-10970. In later times it served as a bird dog spotting fires and was registered as N471DF. It has been nicely restored back to its former USAF scheme.